HARQ feedback codebook including deferred HARQ feedback

ABSTRACT

A wireless may determine an initial timing of a first HARQ feedback and a first timing of second HARQ feedback(s). The wireless device may determine to defer the first HARQ feedback from the initial timing to the first timing. The wireless device may transmit, in the first timing, a HARQ feedback codebook comprising the first HARQ feedback and the second HARQ feedback(s). Based on the first HARQ feedback being deferred, a first position of the first HARQ feedback in the HARQ feedback codebook may be after second position(s) of the second HARQ feedback(s).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.17/492,945, filed Oct. 4, 2021, which claims the benefit of U.S.Provisional Application No. 63/087,266, filed Oct. 4, 2020, which ishereby incorporated by reference in its entirety.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A and FIG. 1B show examples of mobile communications systems inaccordance with several of various embodiments of the presentdisclosure.

FIG. 2A and FIG. 2B show examples of user plane and control planeprotocol layers in accordance with several of various embodiments of thepresent disclosure.

FIG. 3 shows example functions and services offered by protocol layersin a user plane protocol stack in accordance with several of variousembodiments of the present disclosure.

FIG. 4 shows example flow of packets through the protocol layers inaccordance with several of various embodiments of the presentdisclosure.

FIG. 5A shows example mapping of channels between layers of the protocolstack and different physical signals in downlink in accordance withseveral of various embodiments of the present disclosure.

FIG. 5B shows example mapping of channels between layers of the protocolstack and different physical signals in uplink in accordance withseveral of various embodiments of the present disclosure.

FIG. 6 shows example physical layer processes for signal transmission inaccordance with several of various embodiments of the presentdisclosure.

FIG. 7 shows examples of RRC states and RRC state transitions inaccordance with several of various embodiments of the presentdisclosure.

FIG. 8 shows an example time domain transmission structure in NR bygrouping OFDM symbols into slots, subframes and frames in accordancewith several of various embodiments of the present disclosure.

FIG. 9 shows an example of time-frequency resource grid in accordancewith several of various embodiments of the present disclosure.

FIG. 10 shows example adaptation and switching of bandwidth parts inaccordance with several of various embodiments of the presentdisclosure.

FIG. 11A shows example arrangements of carriers in carrier aggregationin accordance with several of various embodiments of the presentdisclosure.

FIG. 11B shows examples of uplink control channel groups in accordancewith several of various embodiments of the present disclosure.

FIG. 12A, FIG. 12B and FIG. 12C show example random access processes inaccordance with several of various embodiments of the presentdisclosure.

FIG. 13A shows example time and frequency structure of SSBs and theirassociations with beams in accordance with several of variousembodiments of the present disclosure.

FIG. 13B shows example time and frequency structure of CSI-RSs and theirassociation with beams in accordance with several of various embodimentsof the present disclosure.

FIG. 14A, FIG. 14B and FIG. 14C show example beam management processesin accordance with several of various embodiments of the presentdisclosure.

FIG. 15 shows example components of a wireless device and a base stationthat are in communication via an air interface in accordance withseveral of various embodiments of the present disclosure.

FIG. 16 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 17 shows an example information element in accordance with severalof various embodiments of the present disclosure.

FIG. 18 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 19 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 20 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 21 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 22 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 23 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 24 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 25 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 26 shows an example process in accordance with several of variousembodiments of the present disclosure.

FIG. 27 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure.

FIG. 28 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure.

FIG. 29 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure.

FIG. 30 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure.

FIG. 31 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure.

FIG. 32 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure.

DETAILED DESCRIPTION

The exemplary embodiments of the disclosed technology enable processesfor a wireless device and/or one or more base stations for feedbackenhancement. The exemplary disclosed embodiments may be implemented inthe technical field of wireless communication systems. Moreparticularly, the embodiments of the disclosed technology may relate toenhancement of hybrid automatic repeat request (HARQ) feedback andrelated processes.

The devices and/or nodes of the mobile communications system disclosedherein may be implemented based on various technologies and/or variousreleases/versions/amendments of a technology. The various technologiesinclude various releases of long-term evolution (LTE) technologies,various releases of 5G new radio (NR) technologies, various wirelesslocal area networks technologies and/or a combination thereof and/oralike. For example, a base station may support a given technology andmay communicate with wireless devices with different characteristics.The wireless devices may have different categories that define theircapabilities in terms of supporting various features. The wirelessdevice with the same category may have different capabilities. Thewireless devices may support various technologies such as variousreleases of LTE technologies, various releases of 5G NR technologiesand/or a combination thereof and/or alike. At least some of the wirelessdevices in the mobile communications system of the present disclosuremay be stationary or almost stationary. In this disclosure, the terms“mobile communications system” and “wireless communications system” maybe used interchangeably.

FIG. 1A shows an example of a mobile communications system 100 inaccordance with several of various embodiments of the presentdisclosure. The mobile communications system 100 may be, for example,run by a mobile network operator (MNO) or a mobile virtual networkoperator (MVNO). The mobile communications system 100 may be a publicland mobile network (PLMN) run by a network operator providing a varietyof service including voice, data, short messaging service (SMS),multimedia messaging service (MMS), emergency calls, etc. The mobilecommunications system 100 includes a core network (CN) 106, a radioaccess network (RAN) 104 and at least one wireless device 102.

The CN 106 connects the RAN 104 to one or more external networks (e.g.,one or more data networks such as the Internet) and is responsible forfunctions such as authentication, charging and end-to-end connectionestablishment. Several radio access technologies (RATs) may be served bythe same CN 106.

The RAN 104 may implement a RAT and may operate between the at least onewireless device 102 and the CN 106. The RAN 104 may handle radio relatedfunctionalities such as scheduling, radio resource control, modulationand coding, multi-antenna transmissions and retransmission protocols.The wireless device and the RAN may share a portion of the radiospectrum by separating transmissions from the wireless device to the RANand the transmissions from the RAN to the wireless device. The directionof the transmissions from the wireless device to the RAN is known as theuplink and the direction of the transmissions from the RAN to thewireless device is known as the downlink. The separation of uplink anddownlink transmissions may be achieved by employing a duplexingtechnique. Example duplexing techniques include frequency divisionduplexing (FDD), time division duplexing (TDD) or a combination of FDDand TDD.

In this disclosure, the term wireless device may refer to a device thatcommunicates with a network entity or another device using wirelesscommunication techniques. The wireless device may be a mobile device ora non-mobile (e.g., fixed) device. Examples of the wireless deviceinclude cellular phone, smart phone, tablet, laptop computer, wearabledevice (e.g., smart watch, smart shoe, fitness trackers, smart clothing,etc.), wireless sensor, wireless meter, extended reality (XR) devicesincluding augmented reality (AR) and virtual reality (VR) devices,Internet of Things (IoT) device, vehicle to vehicle communicationsdevice, road-side units (RSU), automobile, relay node or any combinationthereof. In some examples, the wireless device (e.g., a smart phone,tablet, etc.) may have an interface (e.g., a graphical user interface(GUI)) for configuration by an end user. In some examples, the wirelessdevice (e.g., a wireless sensor device, etc.) may not have an interfacefor configuration by an end user. The wireless device may be referred toas a user equipment (UE), a mobile station (MS), a subscriber unit, ahandset, an access terminal, a user terminal, a wireless transmit andreceive unit (WTRU) and/or other terminology.

The at least one wireless device may communicate with at least one basestation in the RAN 104. In this disclosure, the term base station mayencompass terminologies associated with various RATs. For example, abase station may be referred to as a Node B in a 3G cellular system suchas Universal Mobile Telecommunication Systems (UMTS), an evolved Node B(eNB) in a 4G cellular system such as evolved universal terrestrialradio access (E-UTRA), a next generation eNB (ng-eNB), a Next GenerationNode B (gNB) in NR and/or a 5G system, an access point (AP) in Wi-Fiand/or other wireless local area networks. A base station may bereferred to as a remote radio head (RRH), a baseband unit (BBU) inconnection with one or more RRHs, a repeater or relay for coverageextension and/or any combination thereof. In some examples, all protocollayers of a base station may be implemented in one unit. In someexample, some of the protocol layers (e.g., upper layers) of the basestation may be implemented in a first unit (e.g., a central unit (CU))and some other protocol layer (e.g., lower layers) may be implemented inone or more second units (e.g., distributed units (DUs)).

A base station in the RAN 104 includes one or more antennas tocommunicate with the at least one wireless device. The base station maycommunicate with the at least one wireless device using radio frequency(RF) transmissions and receptions via RF transceivers. The base stationantennas may control one or more cells (or sectors). The size and/orradio coverage area of a cell may depend on the range that transmissionsby a wireless device can be successfully received by the base stationwhen the wireless device transmits using the RF frequency of the cell.The base station may be associated with cells of various sizes. At agiven location, the wireless device may be in coverage area of a firstcell of the base station and may not be in coverage area of a secondcell of the base station depending on the sizes of the first cell andthe second cell.

A base station in the RAN 104 may have various implementations. Forexample, a base station may be implemented by connecting a BBU (or a BBUpool) coupled to one or more RRHs and/or one or more relay nodes toextend the cell coverage. The BBU pool may be located at a centralizedsite like a cloud or data center. The BBU pool may be connected to aplurality of RRHs that control a plurality of cells. The combination ofBBU with the one or more RRHs may be referred to as a centralized orcloud RAN (C-RAN) architecture. In some implementations, the BBUfunctions may be implemented on virtual machines (VMs) on servers at acentralized location. This architecture may be referred to as virtualRAN (vRAN). All, most or a portion of the protocol layer functions(e.g., all or portions of physical layer, medium access control (MAC)layer and/or higher layers) may be implemented at the BBU pool and theprocessed data may be transmitted to the RRHs for further processingand/or RF transmission. The links between the BBU pool and the RRHs maybe referred to as fronthaul.

In some deployment scenarios, the RAN 104 may include macrocell basestations with high transmission power levels and large coverage areas.In other deployment scenarios, the RAN 104 may include base stationsthat employ different transmission power levels and/or have cells withdifferent coverage areas. For example, some base station may bemacrocell base stations with high transmission powers and/or largecoverage areas and other base station may be small cell base stationswith comparatively smaller transmission powers and/or coverage areas. Insome deployment scenarios, a small cell base station may have coveragethat is within or has overlap with coverage area of a macrocell basestation. A wireless device may communicate with the macrocell basestation while within the coverage area of the macrocell base station.For additional capacity, the wireless device may communicate with boththe macrocell base station and the small cell base station while in theoverlapped coverage area of the macrocell base station and the smallcell base station. Depending on their coverage areas, a small cell basestation may be referred to as a microcell base station, a picocell basestation, a femtocell base station or a home base station.

Different standard development organizations (SDOs) have specified, ormay specify in future, mobile communications systems that have similarcharacteristics as the mobile communications system 100 of FIG. 1A. Forexample, the Third-Generation Partnership Project (3GPP) is a group ofSDOs that provides specifications that define 3GPP technologies formobile communications systems that are akin to the mobile communicationssystem 100. The 3GPP has developed specifications for third generation(3G) mobile networks, fourth generation (4G) mobile networks and fifthgeneration (5G) mobile networks. The 3G, 4G and 5G networks are alsoknown as Universal Mobile Telecommunications System (UMTS), Long TermEvolution (LTE) and 5G system (5GS), respectively. In this disclosure,embodiments are described with respect to the RAN implemented in a 3GPP5G mobile network that is also referred to as next generation RAN(NG-RAN). The embodiments may also be implemented in other mobilecommunications systems such as 3G or 4G mobile networks or mobilenetworks that may be standardized in future such as sixth generation(6G) mobile networks or mobile networks that are implemented bystandards bodies other than 3GPP. The NG-RAN may be based on a new RATknown as new radio (NR) and/or other radio access technologies such asLTE and/or non-3GPP RATs.

FIG. 1B shows an example of a mobile communications system 110 inaccordance with several of various embodiments of the presentdisclosure. The mobile communications system 110 of FIG. 1B is anexample of a 5G mobile network and includes a 5G CN (5G-CN) 130, anNG-RAN 120 and UEs (collectively 112 and individually UE 112A and UE112B). The 5G-CN 130, the NG-RAN 120 and the UEs 112 of FIG. 1B operatesubstantially alike the CN 106, the RAN 104 and the at least onewireless device 102, respectively, as described for FIG. 1A.

The 5G-CN 130 of FIG. 1B connects the NG-RAN 120 to one or more externalnetworks (e.g., one or more data networks such as the Internet) and isresponsible for functions such as authentication, charging andend-to-end connection establishment. The 5G-CN has new enhancementscompared to previous generations of CNs (e.g., evolved packet core (EPC)in the 4G networks) including service-based architecture, support fornetwork slicing and control plane/user plane split. The service-basedarchitecture of the 5G-CN provides a modular framework based on serviceand functionalities provided by the core network wherein a set ofnetwork functions are connected via service-based interfaces. Thenetwork slicing enables multiplexing of independent logical networks(e.g., network slices) on the same physical network infrastructure. Forexample, a network slice may be for mobile broadband applications withfull mobility support and a different network slice may be fornon-mobile latency-critical applications such as industry automation.The control plane/user plane split enables independent scaling of thecontrol plane and the user plane. For example, the control planecapacity may be increased without affecting the user plane of thenetwork.

The 5G-CN 130 of FIG. 1B includes an access and mobility managementfunction (AMF) 132 and a user plane function (UPF) 134. The AMF 132 maysupport termination of non-access stratum (NAS) signaling, NAS signalingsecurity such as ciphering and integrity protection, inter-3GPP accessnetwork mobility, registration management, connection management,mobility management, access authentication and authorization andsecurity context management. The NAS is a functional layer between a UEand the CN and the access stratum (AS) is a functional layer between theUE and the RAN. The UPF 134 may serve as an interconnect point betweenthe NG-RAN and an external data network. The UPF may support packetrouting and forwarding, packet inspection and Quality of Service (QoS)handling and packet filtering. The UPF may further act as a ProtocolData Unit (PDU) session anchor point for mobility within and betweenRATs.

The 5G-CN 130 may include additional network functions (not shown inFIG. 1B) such as one or more Session Management Functions (SMFs), aPolicy Control Function (PCF), a Network Exposure Function (NEF), aUnified Data Management (UDM), an Application Function (AF), and/or anAuthentication Server Function (AUSF). These network functions alongwith the AMF 132 and UPF 134 enable a service-based architecture for the5G-CN.

The NG-RAN 120 may operate between the UEs 112 and the 5G-CN 130 and mayimplement one or more RATs. The NG-RAN 120 may include one or more gNBs(e.g., gNB 122A or gNB 122B or collectively gNBs 122) and/or one or moreng-eNBs (e.g., ng-eNB 124A or ng-eNB 124B or collectively ng-eNBs 124).The general terminology for gNB s 122 and/or an ng-eNBs 124 is a basestation and may be used interchangeably in this disclosure. The gNBs 122and the ng-eNBs 124 may include one or more antennas to communicate withthe UEs 112. The one or more antennas of the gNB s 122 or ng-eNBs 124may control one or more cells (or sectors) that provide radio coveragefor the UEs 112.

A gNB and/or an ng-eNB of FIG. 1B may be connected to the 5G-CN 130using an NG interface. A gNB and/or an ng-eNB may be connected withother gNBs and/or ng-eNBs using an Xn interface. The NG or the Xninterfaces are logical connections that may be established using anunderlying transport network. The interface between a UE and a gNB orbetween a UE and an ng-eNBs may be referred to as the Uu interface. Aninterface (e.g., Uu, NG or Xn) may be established by using a protocolstack that enables data and control signaling exchange between entitiesin the mobile communications system of FIG. 1B. When a protocol stack isused for transmission of user data, the protocol stack may be referredto as user plane protocol stack. When a protocol stack is used fortransmission of control signaling, the protocol stack may be referred toas control plane protocol stack. Some protocol layer may be used in bothof the user plane protocol stack and the control plane protocol stackwhile other protocol layers may be specific to the user plane or controlplane.

The NG interface of FIG. 1B may include an NG-User plane (NG-U)interface between a gNB and the UPF 134 (or an ng-eNB and the UPF 134)and an NG-Control plane (NG-C) interface between a gNB and the AMF 132(or an ng-eNB and the AMF 132). The NG-U interface may providenon-guaranteed delivery of user plane PDUs between a gNB and the UPF oran ng-eNB and the UPF. The NG-C interface may provide services such asNG interface management, UE context management, UE mobility management,transport of NAS messages, paging, PDU session management, configurationtransfer and/or warning message transmission.

The UEs 112 and a gNB may be connected using the Uu interface and usingthe NR user plane and control plane protocol stack. The UEs 112 and anng-eNB may be connected using the Uu interface using the LTE user planeand control plane protocol stack.

In the example mobile communications system of FIG. 1B, a 5G-CN isconnected to a RAN comprised of 4G LTE and/or 5G NR RATs. In otherexample mobile communications systems, a RAN based on the 5G NR RAT maybe connected to a 4G CN (e.g., EPC). For example, earlier releases of 5Gstandards may support a non-standalone mode of operation where a NRbased RAN is connected to the 4G EPC. In an example non-standalone mode,a UE may be connected to both a 5G NR gNB and a 4G LTE eNB (e.g., ang-eNB) and the control plane functionalities (such as initial access,paging and mobility) may be provided through the 4G LTE eNB. In astandalone of operation, the 5G NR gNB is connected to a 5G-CN and theuser plane and the control plane functionalities are provided by the 5GNR gNB.

FIG. 2A shows an example of the protocol stack for the user plan of anNR Uu interface in accordance with several of various embodiments of thepresent disclosure. The user plane protocol stack comprises fiveprotocol layers that terminate at the UE 200 and the gNB 210. The fiveprotocol layers, as shown in FIG. 2A, include physical (PHY) layerreferred to as PHY 201 at the UE 200 and PHY 211 at the gNB 210, mediumaccess control (MAC) layer referred to as MAC 202 at the UE 200 and MAC212 at the gNB 210, radio link control (RLC) layer referred to as RLC203 at the UE 200 and RLC 213 at the gNB 210, packet data convergenceprotocol (PDCP) layer referred to as PDCP 204 at the UE 200 and PDCP 214at the gNB 210, and service data application protocol (SDAP) layerreferred to as SDAP 205 at the UE 200 and SDAP 215 at the gNB 210. ThePHY layer, also known as layer 1 (L1), offers transport services tohigher layers. The other four layers of the protocol stack (MAC, RLC,PDCP and SDAP) are collectively known as layer 2 (L2).

FIG. 2B shows an example of the protocol stack for the control plan ofan NR Uu interface in accordance with several of various embodiments ofthe present disclosure. Some of the protocol layers (PHY, MAC, RLC andPDCP) are common between the user plane protocol stack shown in FIG. 2Aand the control plan protocol stack. The control plane protocol stackalso includes the RRC layer, referred to RRC 206 at the UE 200 and RRC216 at the gNB 210, that also terminates at the UE 200 and the gNB 210.In addition, the control plane protocol stack includes the NAS layerthat terminates at the UE 200 and the AMF 220. In FIG. 2B, the NAS layeris referred to as NAS 207 at the UE 200 and NAS 227 at the AMF 220.

FIG. 3 shows example functions and services offered to other layers by alayer in the NR user plane protocol stack of FIG. 2A in accordance withseveral of various embodiments of the present disclosure. For example,the SDAP layer of FIG. 3 (shown in FIG. 2A as SDAP 205 at the UE sideand SDAP 215 at the gNB side) may perform mapping and de-mapping of QoSflows to data radio bearers. The mapping and de-mapping may be based onQoS (e.g., delay, throughput, jitter, error rate, etc.) associated witha QoS flow. A QoS flow may be a QoS differentiation granularity for aPDU session which is a logical connection between a UE 200 and a datanetwork. A PDU session may contain one or more QoS flows. The functionsand services of the SDAP layer include mapping and de-mapping betweenone or more QoS flows and one or more data radio bearers. The SDAP layermay also mark the uplink and/or downlink packets with a QoS flow ID(QFI).

The PDCP layer of FIG. 3 (shown in FIG. 2A as PDCP 204 at the UE sideand PDCP 214 at the gNB side) may perform header compression anddecompression (e.g., using Robust Header Compression (ROHC) protocol) toreduce the protocol header overhead, ciphering and deciphering andintegrity protection and verification to enhance the security over theair interface, reordering and in-order delivery of packets anddiscarding of duplicate packets. A UE may be configured with one PDCPentity per bearer.

In an example scenario not shown in FIG. 3 , a UE may be configured withdual connectivity and may connect to two different cell groups providedby two different base stations. For example, a base station of the twobase stations may be referred to as a master base station and a cellgroup provided by the master base station may be referred to as a mastercell group (MCG). The other base station of the two base stations may bereferred to as a secondary base station and the cell group provided bythe secondary base station may be referred to as a secondary cell group(SCG). A bearer may be configured for the UE as a split bearer that maybe handled by the two different cell groups. The PDCP layer may performrouting of packets corresponding to a split bearer to and/or from RLCchannels associated with the cell groups.

In an example scenario not shown in FIG. 3 , a bearer of the UE may beconfigured (e.g., with control signaling) with PDCP packet duplication.A bearer configured with PDCP duplication may be mapped to a pluralityof RLC channels each corresponding to different one or more cells. ThePDCP layer may duplicate packets of the bearer configured with PDCPduplication and the duplicated packets may be mapped to the differentRLC channels. With PDCP packet duplication, the likelihood of correctreception of packets increases thereby enabling higher reliability.

The RLC layer of FIG. 3 (shown in FIG. 2A as RLC 203 at the UE side andRLC 213 at the gNB side) provides service to upper layers in the form ofRLC channels. The RLC layer may include three transmission modes:transparent mode (TM), Unacknowledged mode (UM) and Acknowledged mode(AM). The RLC layer may perform error correction through automaticrepeat request (ARQ) for the AM transmission mode, segmentation of RLCservice data units (SDUs) for the AM and UM transmission modes andre-segmentation of RLC SDUs for AM transmission mode, duplicatedetection for the AM transmission mode, RLC SDU discard for the AM andUM transmission modes, etc. The UE may be configured with one RLC entityper RLC channel.

The MAC layer of FIG. 3 (shown in FIG. 2A as MAC 202 at the UE side andMAC 212 at the gNB side) provides services to the RLC layer in form oflogical channels. The MAC layer may perform mapping between logicalchannels and transport channels, multiplexing/demultiplexing of MAC SDUsbelonging to one or more logical channels into/from transport blocks(TBs) delivered to/from the physical layer on transport channels,reporting of scheduling information, error correction through hybridautomatic repeat request (HARM), priority handling between UEs by meansof dynamic scheduling, priority handling between logical channels of oneUE by means of logical channel prioritization and/or padding. In case ofcarrier aggregation, a MAC entity may comprise one HARQ entity per cell.A MAC entity may support multiple numerologies, transmission timings andcells. The control signaling may configure logical channels with mappingrestrictions. The mapping restrictions in logical channel prioritizationmay control the numerology(ies), cell(s), and/or transmissiontiming(s)/duration(s) that a logical channel may use.

The PHY layer of FIG. 3 (shown in FIG. 2A as PHY 201 at the UE side andPHY 211 at the gNB side) provides transport services to the MAC layer inform of transport channels. The physical layer may handlecoding/decoding, HARQ soft combining, rate matching of a coded transportchannel to physical channels, mapping of coded transport channels tophysical channels, modulation and demodulation of physical channels,frequency and time synchronization, radio characteristics measurementsand indication to higher layers, RF processing, and mapping to antennasand radio resources.

FIG. 4 shows example processing of packets at different protocol layersin accordance with several of various embodiments of the presentdisclosure. In this example, three Internet Protocol (IP) packets thatare processed by the different layers of the NR protocol stack. The termSDU shown in FIG. 4 is the data unit that is entered from/to a higherlayer. In contrast, a protocol data unit (PDU) is the data unit that isentered to/from a lower layer. The flow of packets in FIG. 4 is fordownlink. An uplink data flow through layers of the NR protocol stack issimilar to FIG. 4 . In this example, the two leftmost IP packets aremapped by the SDAP layer (shown as SDAP 205 and SDAP 215 in FIG. 2A) toradio bearer 402 and the rightmost packet is mapped by the SDAP layer tothe radio bearer 404. The SDAP layer adds SDAP headers to the IP packetswhich are entered into the PDCP layer as PDCP SDUs. The PDCP layer isshown as PDCP 204 and PDCP 214 in FIG. 2A. The PDCP layer adds the PDCPheaders to the PDCP SDUs which are entered into the RLC layer as RLCSDUs. The RLC layer is shown as RLC 203 and RLC 213 in FIG. 2A. An RLCSDU may be segmented at the RLC layer. The RLC layer adds RLC headers tothe RLC SDUs after segmentation (if segmented) which are entered intothe MAC layer as MAC SDUs. The MAC layer adds the MAC headers to the MACSDUs and multiplexes one or more MAC SDUs to form a PHY SDU (alsoreferred to as a transport block (TB) or a MAC PDU).

In FIG. 4 , the MAC SDUs are multiplexed to form a transport block. TheMAC layer may multiplex one or more MAC control elements (MAC CEs) withzero or more MAC SDUs to form a transport block. The MAC CEs may also bereferred to as MAC commands or MAC layer control signaling and may beused for in-band control signaling. The MAC CEs may be transmitted by abase station to a UE (e.g., downlink MAC CEs) or by a UE to a basestation (e.g., uplink MAC CEs). The MAC CEs may be used for transmissionof information useful by a gNB for scheduling (e.g., buffer statusreport (BSR) or power headroom report (PHR)), activation/deactivation ofone or more cells, activation/deactivation of configured radio resourcesfor or one or more processes, activation/deactivation of one or moreprocesses, indication of parameters used in one or more processes, etc.

FIG. 5A and FIG. 5B show example mapping between logical channels,transport channels and physical channels for downlink and uplink,respectively in accordance with several of various embodiments of thepresent disclosure. As discussed before, the MAC layer provides servicesto higher layer in the form of logical channels. A logical channel maybe classified as a control channel, if used for transmission of controland/or configuration information, or a traffic channel if used fortransmission of user data. Example logical channels in NR includeBroadcast Control Channel (BCCH) used for transmission of broadcastsystem control information, Paging Control Channel (PCCH) used forcarrying paging messages for wireless devices with unknown locations,Common Control Channel (CCCH) used for transmission of controlinformation between UEs and network and for UEs that have no RRCconnection with the network, Dedicated Control Channel (DCCH) which is apoint-to-point bi-directional channel for transmission of dedicatedcontrol information between a UE that has an RRC connection and thenetwork and Dedicated Traffic Channel (DTCH) which is point-to-pointchannel, dedicated to one UE, for the transfer of user information andmay exist in both uplink and downlink.

As discussed before, the PHY layer provides services to the MAC layerand higher layers in the form of transport channels. Example transportchannels in NR include Broadcast Channel (BCH) used for transmission ofpart of the BCCH referred to as master information block (MIB), DownlinkShared Channel (DL-SCH) used for transmission of data (e.g., from DTCHin downlink) and various control information (e.g., from DCCH and CCCHin downlink and part of the BCCH that is not mapped to the BCH), UplinkShared Channel (UL-SCH) used for transmission of uplink data (e.g., fromDTCH in uplink) and control information (e.g., from CCCH and DCCH inuplink) and Paging Channel (PCH) used for transmission of paginginformation from the PCCH. In addition, Random Access Channel (RACH) isa transport channel used for transmission of random access preambles.The RACH does not carry a transport block. Data on a transport channel(except RACH) may be organized in transport blocks, wherein One or moretransport blocks may be transmitted in a transmission time interval(TTI).

The PHY layer may map the transport channels to physical channels. Aphysical channel may correspond to time-frequency resources that areused for transmission of information from one or more transportchannels. In addition to mapping transport channels to physicalchannels, the physical layer may generate control information (e.g.,downlink control information (DCI) or uplink control information (UCI))that may be carried by the physical channels. Example DCI includescheduling information (e.g., downlink assignments and uplink grants),request for channel state information report, power control command,etc. Example UCI include HARQ feedback indicating correct or incorrectreception of downlink transport blocks, channel state informationreport, scheduling request, etc. Example physical channels in NR includea Physical Broadcast Channel (PBCH) for carrying information from theBCH, a Physical Downlink Shared Channel (PDSCH) for carrying informationform the PCH and the DL-SCH, a Physical Downlink Control Channel (PDCCH)for carrying DCI, a Physical Uplink Shared Channel (PUSCH) for carryinginformation from the UL-SCH and/or UCI, a Physical Uplink ControlChannel (PUCCH) for carrying UCI and Physical Random Access Channel(PRACH) for transmission of RACH (e.g., random access preamble).

The PHY layer may also generate physical signals that are not originatedfrom higher layers. As shown in FIG. 5A, example downlink physicalsignals include Demodulation Reference Signal (DM-RS), Phase TrackingReference Signal (PT-RS), Channel State Information Reference Signal(CSI-RS), Primary Synchronization Signal (PSS) and SecondarySynchronization Signal (SSS). As shown in FIG. 5B, example uplinkphysical signals include DM-RS, PT-RS and sounding reference signal(SRS).

As indicated earlier, some of the protocol layers (PHY, MAC, RLC andPDCP) of the control plane of an NR Uu interface, are common between theuser plane protocol stack (as shown in FIG. 2A) and the control planeprotocol stack (as shown in FIG. 2B). In addition to PHY, MAC, RLC andPDCP, the control plane protocol stack includes the RRC protocol layerand the NAS protocol layer.

The NAS layer, as shown in FIG. 2B, terminates at the UE 200 and the AMF220 entity of the 5G-C 130. The NAS layer is used for core networkrelated functions and signaling including registration, authentication,location update and session management. The NAS layer uses services fromthe AS of the Uu interface to transmit the NAS messages.

The RRC layer, as shown in FIG. 2B, operates between the UE 200 and thegNB 210 (more generally NG-RAN 120) and may provide services andfunctions such as broadcast of system information (SI) related to AS andNAS as well as paging initiated by the 5G-C 130 or NG-RAN 120. Inaddition, the RRC layer is responsible for establishment, maintenanceand release of an RRC connection between the UE 200 and the NG-RAN 120,carrier aggregation configuration (e.g., addition, modification andrelease), dual connectivity configuration (e.g., addition, modificationand release), security related functions, radio bearerconfiguration/maintenance and release, mobility management (e.g.,maintenance and context transfer), UE cell selection and reselection,inter-RAT mobility, QoS management functions, UE measurement reportingand control, radio link failure (RLF) detection and NAS messagetransfer. The RRC layer uses services from PHY, MAC, RLC and PDCP layersto transmit RRC messages using signaling radio bearers (SRBs). The SRBsare mapped to CCCH logical channel during connection establishment andto DCCH logical channel after connection establishment.

FIG. 6 shows example physical layer processes for signal transmission inaccordance with several of various embodiments of the presentdisclosure. Data and/or control streams from MAC layer may beencoded/decoded to offer transport and control services over the radiotransmission link. For example, one or more (e.g., two as shown in FIG.6 ) transport blocks may be received from the MAC layer for transmissionvia a physical channel (e.g., a physical downlink shared channel or aphysical uplink shared channel). A cyclic redundancy check (CRC) may becalculated and attached to a transport block in the physical layer. TheCRC calculation may be based on one or more cyclic generatorpolynomials. The CRC may be used by the receiver for error detection.Following the transport block CRC attachment, a low-density parity check(LDPC) base graph selection may be performed. In example embodiments,two LDPC base graphs may be used wherein a first LDPC base graph may beoptimized for small transport blocks and a second LDPC base graph may beoptimized for comparatively larger transport blocks.

The transport block may be segmented into code blocks and code block CRCmay be calculated and attached to a code block. A code block may be LDPCcoded and the LDPC coded blocks may be individually rate matched. Thecode blocks may be concatenated to create one or more codewords. Thecontents of a codeword may be scrambled and modulated to generate ablock of complex-valued modulation symbols. The modulation symbols maybe mapped to a plurality of transmission layers (e.g., multiple-inputmultiple-output (MIMO) layers) and the transmission layers may besubject to transform precoding and/or precoding. The precodedcomplex-valued symbols may be mapped to radio resources (e.g., resourceelements). The signal generator block may create a baseband signal andup-convert the baseband signal to a carrier frequency for transmissionvia antenna ports. The signal generator block may employ mixers, filtersand/or other radio frequency (RF) components prior to transmission viathe antennas. The functions and blocks in FIG. 6 are illustrated asexamples and other mechanisms may be implemented in various embodiments.

FIG. 7 shows examples of RRC states and RRC state transitions at a UE inaccordance with several of various embodiments of the presentdisclosure. A UE may be in one of three RRC states: RRC_IDLE 702, RRCINACTIVE 704 and RRC_CONNECTED 706. In RRC_IDLE 702 state, no RRCcontext (e.g., parameters needed for communications between the UE andthe network) may be established for the UE in the RAN. In RRC_IDLE 702state, no data transfer between the UE and the network may take placeand uplink synchronization is not maintained. The wireless device maysleep most of the time and may wake up periodically to receive pagingmessages. The uplink transmission of the UE may be based on a randomaccess process and to enable transition to the RRC_CONNECTED 706 state.The mobility in RRC_IDLE 702 state is through a cell reselectionprocedure where the UE camps on a cell based on one or more criteriaincluding signal strength that is determined based on the UEmeasurements.

In RRC_CONNECTED 706 state, the RRC context is established and both theUE and the RAN have necessary parameters to enable communicationsbetween the UE and the network. In the RRC_CONNECTED 706 state, the UEis configured with an identity known as a Cell Radio Network TemporaryIdentifier (C-RNTI) that is used for signaling purposes (e.g., uplinkand downlink scheduling, etc.) between the UE and the RAN. The wirelessdevice mobility in the RRC_CONNECTED 706 state is managed by the RAN.The wireless device provides neighboring cells and/or current servingcell measurements to the network and the network may make hand overdecisions. Based on the wireless device measurements, the currentserving base station may send a handover request message to aneighboring base station and may send a handover command to the wirelessdevice to handover to a cell of the neighboring base station. Thetransition of the wireless device from the RRC_IDLE 702 state to theRRC_CONNECTED 706 state or from the RRC_CONNECTED 706 state to theRRC_IDLE 702 state may be based on connection establishment andconnection release procedures (shown collectively as connectionestablishment/release 710 in FIG. 7 ).

To enable a faster transition to the RRC_CONNECTED 706 state (e.g.,compared to transition from RRC_IDLE 702 state to RRC_CONNECTED 706state), an RRC_INACTIVE 704 state is used for an NR UE wherein, the RRCcontext is kept at the UE and the RAN. The transition from theRRC_INACTIVE 704 state to the RRC_CONNECTED 706 state is handled by RANwithout CN signaling. Similar to the RRC_IDLE 702 state, the mobility inRRC_INACTIVE 704 state is based on a cell reselection procedure withoutinvolvement from the network. The transition of the wireless device fromthe RRC_INACTIVE 704 state to the RRC_CONNECTED 706 state or from theRRC_CONNECTED 706 state to the RRC_INACTIVE 704 state may be based onconnection resume and connection inactivation procedures (showncollectively as connection resume/inactivation 712 in FIG. 7 ). Thetransition of the wireless device from the RRC_INACTIVE 704 state to theRRC_IDLE 702 state may be based on a connection release 714 procedure asshown in FIG. 7 .

In NR, Orthogonal Frequency Division Multiplexing (OFDM), also calledcyclic prefix OFDM (CP-OFDM), is the baseline transmission scheme inboth downlink and uplink of NR and the Discrete Fourier Transform (DFT)spread OFDM (DFT-s-OFDM) is a complementary uplink transmission inaddition to the baseline OFDM scheme. OFDM is multi-carrier transmissionscheme wherein the transmission bandwidth may be composed of severalnarrowband sub-carriers. The subcarriers are modulated by the complexvalued OFDM modulation symbols resulting in an OFDM signal. The complexvalued OFDM modulation symbols are obtained by mapping, by a modulationmapper, the input data (e.g., binary digits) to different points of amodulation constellation diagram. The modulation constellation diagramdepends on the modulation scheme. NR may use different types ofmodulation schemes including Binary Phase Shift Keying (BPSK), π/2-BPSK,Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation(16QAM), 64QAM and 256QAM. Different and/or higher order modulationschemes (e.g., M-QAM in general) may be used. An OFDM signal with Nsubcarriers may be generated by processing N subcarriers in parallel forexample by using Inverse Fast Fourier Transform (IFFT) processing. TheOFDM receiver may use FFT processing to recover the transmitted OFDMmodulation symbols. The subcarrier spacing of subcarriers in an OFDMsignal is inversely proportional to an OFDM modulation symbol duration.For example, for a 15 KHz subcarrier spacing, duration of an OFDM signalis nearly 66.7 μs. To enhance the robustness of OFDM transmission intime dispersive channels, a cyclic prefix (CP) may be inserted at thebeginning of an OFDM symbol. For example, the last part of an OFDMsymbol may be copied and inserted at the beginning of an OFDM symbol.The CP insertion enhanced the OFDM transmission scheme by preservingsubcarrier orthogonality in time dispersive channels.

In NR, different numerologies may be used for OFDM transmission. Anumerology of OFDM transmission may indicate a subcarrier spacing and aCP duration for the OFDM transmission. For example, a subcarrier spacingin NR may generally be a multiple of 15 KHz and expressed as Δf=2^(μ)·15KHz (μ=0, 1, 2, . . . ). Example subcarrier spacings used in NR include15 KHz (μ=0), 30 KHz (μ=1), 60 KHz (μ=2), 120 KHz (μ=3) and 240 KHz(μ=4). As discussed before, a duration of OFDM symbol is inverselyproportional to the subcarrier spacing and therefor OFDM symbol durationmay depend on the numerology (e.g., the μ value).

FIG. 8 shows an example time domain transmission structure in NR whereinOFDM symbols are grouped into slots, subframes and frames in accordancewith several of various embodiments of the present disclosure. A slot isa group of N_(symb) ^(slot) OFDM symbols, wherein the N_(symb) ^(slot)may have a constant value (e.g., 14). Since different numerologiesresults in different OFDM symbol durations, duration of a slot may alsodepend on the numerology and may be variable. A subframe may have aduration of 1 ms and may be composed of one or more slots, the number ofwhich may depend on the slot duration. The number of slots per subframeis therefore a function of μ and may generally expressed as N_(slot)^(subframe,μ) and the number of symbols per subframe may be expressed asN_(symb) ^(subframe,μ)=N_(symb) ^(slot)N_(slot) ^(subframe,μ). A framemay have a duration of 10 ms and may consist of 10 subframes. The numberof slots per frame may depend on the numerology and therefore may bevariable. The number of slots per frame may generally be expressed asN_(slot) ^(frame,μ).

An antenna port may be defined as a logical entity such that channelcharacteristics over which a symbol on the antenna port is conveyed maybe inferred from the channel characteristics over which another symbolon the same antenna port is conveyed. For example, for DM-RS associatedwith a PDSCH, the channel over which a PDSCH symbol on an antenna portis conveyed may be inferred from the channel over which a DM-RS symbolon the same antenna port is conveyed, for example, if the two symbolsare within the same resource as the scheduled PDSCH and/or in the sameslot and/or in the same precoding resource block group (PRG). Forexample, for DM-RS associated with a PDCCH, the channel over which aPDCCH symbol on an antenna port is conveyed may be inferred from thechannel over which a DM-RS symbol on the same antenna port is conveyedif, for example, the two symbols are within resources for which the UEmay assume the same precoding being used. For example, for DM-RSassociated with a PBCH, the channel over which a PBCH symbol on oneantenna port is conveyed may be inferred from the channel over which aDM-RS symbol on the same antenna port is conveyed if, for example, thetwo symbols are within a SS/PBCH block transmitted within the same slot,and with the same block index. The antenna port may be different from aphysical antenna. An antenna port may be associated with an antenna portnumber and different physical channels may correspond to differentranges of antenna port numbers.

FIG. 9 shows an example of time-frequency resource grid in accordancewith several of various embodiments of the present disclosure. Thenumber of subcarriers in a carrier bandwidth may be based on thenumerology of OFDM transmissions in the carrier. A resource element,corresponding to one symbol duration and one subcarrier, may be thesmallest physical resource in the time-frequency grid. A resourceelement (RE) for antenna port p and subcarrier spacing configuration μmay be uniquely identified by (k, l)_(p,μ) where k is the index of asubcarrier in the frequency domain and 1 may refer to the symbolposition in the time domain relative to some reference point. A resourceblock may be defined as N_(SC) ^(RB)=12 subcarriers. Since subcarrierspacing depends on the numerology of OFDM transmission, the frequencydomain span of a resource block may be variable and may depend on thenumerology. For example, for a subcarrier spacing of 15 KHz (e.g., μ=0),a resource block may be 180 KHz and for a subcarrier spacing of 30 KHz(e.g., μ=1), a resource block may be 360 KHz.

With large carrier bandwidths defined in NR and due to limitedcapabilities for some UEs (e.g., due to hardware limitations), a UE maynot support an entire carrier bandwidth. Receiving on the full carrierbandwidth may imply high energy consumption. For example, transmittingdownlink control channels on the full downlink carrier bandwidth mayresult in high power consumption for wide carrier bandwidths. NR may usea bandwidth adaptation procedure to dynamically adapt the transmit andreceive bandwidths. The transmit and receive bandwidth of a UE on a cellmay be smaller than the bandwidth of the cell and may be adjusted. Forexample, the width of the transmit and/or receive bandwidth may change(e.g., shrink during period of low activity to save power); the locationof the transmit and/or receive bandwidth may move in the frequencydomain (e.g., to increase scheduling flexibility); and the subcarrierspacing of the transmit or receive bandwidth may change (e.g., to allowdifferent services). A subset of the cell bandwidth may be referred toas a Bandwidth Part (BWP) and bandwidth adaptation may be achieved byconfiguring the UE with one or more BWPs. The base station may configurea UE with a set of downlink BWPs and a set of uplink BWPs. A BWP may becharacterized by a numerology (e.g., subcarrier spacing and cyclicprefix) and a set of consecutive resource blocks in the numerology ofthe BWP. One or more first BWPs of the one or more BWPs of the cell maybe active at a time. An active BWP may be an active downlink BWP or anactive uplink BWP.

FIG. 10 shows an example of bandwidth part adaptation and switching. Inthis example, three BWPs (BWP₁ 1004, BWP₂ 1006 and BWP₃ 1008) areconfigured for a UE on a carrier bandwidth. The BWP₁ is configured witha bandwidth of 40 MHz and a numerology with subcarrier spacing of 15KHz, the BWP₂ is configured with a bandwidth of 10 MHz and a numerologywith subcarrier spacing of 15 KHz and the BWP₃ is configured with abandwidth of 20 MHz and a subcarrier spacing of 60 KHz. The wirelessdevice may switch from a first BWP (e.g., BWP₁) to a second BWP (e.g.,BWP₂). An active BWP of the cell may change from the first BWP to thesecond BWP in response to the BWP switching.

The BWP switching (e.g., BWP switching 1010, BWP switching 1012, BWPswitching 1014, or BWP switching 1016 in FIG. 10 ) may be based on acommand from the base station. The command may be a DCI comprisingscheduling information for the UE in the second BWP. In case of uplinkBWP switching, the first BWP and the second BWP may be uplink BWPs andthe scheduling information may be an uplink grant for uplinktransmission via the second BWP. In case of downlink BWP switching, thefirst BWP and the second BWP may be downlink BWPs and the schedulinginformation may be a downlink assignment for downlink reception via thesecond BWP.

The BWP switching (e.g., BWP switching 1010, BWP switching 1012, BWPswitching 1014, or BWP switching 1016 in FIG. 10 ) may be based on anexpiry of a timer. The base station may configure a wireless device witha BWP inactivity timer and the wireless device may switch to a defaultBWP (e.g., default downlink BWP) based on the expiry of the BWPinactivity timer. The expiry of the BWP inactivity timer may be anindication of low activity on the current active downlink BWP. The basestation may configure the wireless device with the default downlink BWP.If the base station does not configure the wireless device with thedefault BWP, the default BWP may be an initial downlink BWP. The initialactive BWP may be the BWP that the wireless device receives schedulinginformation for remaining system information upon transition to anRRC_CONNECTED state.

A wireless device may monitor a downlink control channel of a downlinkBWP. For example, the UE may monitor a set of PDCCH candidates inconfigured monitoring occasions in one or more configured COntrolREsource SETs (CORESETs) according to the corresponding search spaceconfigurations. A search space configuration may define how/where tosearch for PDCCH candidates. For example, the search space configurationparameters may comprise a monitoring periodicity and offset parameterindicating the slots for monitoring the PDCCH candidates. The searchspace configuration parameters may further comprise a parameterindicating a first symbol with a slot within the slots determined formonitoring PDCCH candidates. A search space may be associated with oneor more CORESETs and the search space configuration may indicate one ormore identifiers of the one or more CORESETs. The search spaceconfiguration parameters may further indicate that whether the searchspace is a common search space or a UE-specific search space. A commonsearch space may be monitored by a plurality of wireless devices and aUE-specific search space may be dedicated to a specific UE.

FIG. 11A shows example arrangements of carriers in carrier aggregationin accordance with several of various embodiments of the presentdisclosure. With carrier aggregation, multiple NR component carriers(CCs) may be aggregated. Downlink transmissions to a wireless device maytake place simultaneously on the aggregated downlink CCs resulting inhigher downlink data rates. Uplink transmissions from a wireless devicemay take place simultaneously on the aggregated uplink CCs resulting inhigher uplink data rates. The component carriers in carrier aggregationmay be on the same frequency band (e.g., intra-band carrier aggregation)or on different frequency bands (e.g., inter-band carrier aggregation).The component carriers may also be contiguous or non-contiguous. Thisresults in three possible carrier aggregation scenarios, intra-bandcontiguous CA 1102, intra-band non-contiguous CA 1104 and inter-band CA1106 as shown in FIG. 11A. Depending on the UE capability for carrieraggregation, a UE may transmit and/or receive on multiple carriers orfor a UE that is not capable of carrier aggregation, the UE may transmitand/or receive on one component carrier at a time. In this disclosure,the carrier aggregation is described using the term cell and a carrieraggregation capable UE may transmit and/or receive via multiple cells.

In carrier aggregation, a UE may be configured with multiple cells. Acell of the multiple cells configured for the UE may be referred to as aPrimary Cell (PCell). The PCell may be the first cell that the UE isinitially connected to. One or more other cells configured for the UEmay be referred to as Secondary Cells (SCells). The base station mayconfigure a UE with multiple SCells. The configured SCells may bedeactivated upon configuration and the base station may dynamicallyactivate or deactivate one or more of the configured SCells based ontraffic and/or channel conditions. The base station may activate ordeactivate configured SCells using a SCell Activation/Deactivation MACCE. The SCell Activation/Deactivation MAC CE may comprise a bitmap,wherein each bit in the bitmap may correspond to a SCell and the valueof the bit indicates an activation status or deactivation status of theSCell.

An SCell may also be deactivated in response to expiry of a SCelldeactivation timer of the SCell. The expiry of an SCell deactivationtimer of an SCell may be an indication of low activity (e.g., lowtransmission or reception activity) on the SCell. The base station mayconfigure the SCell with an SCell deactivation timer. The base stationmay not configure an SCell deactivation timer for an SCell that isconfigured with PUCCH (also referred to as a PUCCH SCell). Theconfiguration of the SCell deactivation timer may be per configuredSCell and different SCells may be configured with different SCelldeactivation timer values. The SCell deactivation timer may be restartedbased on one or more criteria including reception of downlink controlinformation on the SCell indicating uplink grant or downlink assignmentfor the SCell or reception of downlink control information on ascheduling cell indicating uplink grant or downlink assignment for theSCell or transmission of a MAC PDU based on a configured uplink grant orreception of a configured downlink assignment.

A PCell for a UE may be an SCell for another UE and a SCell for a UE maybe PCell for another UE. The configuration of PCell may be UE-specific.One or more SCells of the multiple SCells configured for a UE may beconfigured as downlink-only SCells, e.g., may only be used for downlinkreception and may not be used for uplink transmission. In case ofself-scheduling, the base station may transmit signaling for uplinkgrants and/or downlink assignments on the same cell that thecorresponding uplink or downlink transmission takes place. In case ofcross-carrier scheduling, the base station may transmit signaling foruplink grants and/or downlink assignments on a cell different from thecell that the corresponding uplink or downlink transmission takes place.

FIG. 11B shows examples of uplink control channel groups in accordancewith several of various embodiments of the present disclosure. A basestation may configure a UE with multiple PUCCH groups wherein a PUCCHgroup comprises one or more cells. For example, as shown in FIG. 11B,the base station may configure a UE with a primary PUCCH group 1114 anda secondary PUCCH group 1116. The primary PUCCH group may comprise thePCell 1110 and one or more first SCells. First UCI corresponding to thePCell and the one or more first SCells of the primary PUCCH group may betransmitted by the PUCCH of the PCell. The first UCI may be, forexample, HARQ feedback for downlink transmissions via downlink CCs ofthe PCell and the one or more first SCells. The secondary PUCCH groupmay comprise a PUCCH SCell and one or more second SCells. Second UCIcorresponding to the PUCCH SCell and the one or more second SCells ofthe secondary PUCCH group may be transmitted by the PUCCH of the PUCCHSCell. The second UCI may be, for example, HARQ feedback for downlinktransmissions via downlink CCs of the PUCCH SCell and the one or moresecond SCells.

FIG. 12A, FIG. 12B and FIG. 12C show example random access processes inaccordance with several of various embodiments of the presentdisclosure. FIG. 12A shows an example of four step contention-basedrandom access (CBRA) procedure. The four-step CBRA procedure includesexchanging four messages between a UE and a base station. Msg1 may befor transmission (or retransmission) of a random access preamble by thewireless device to the base station. Msg2 may be the random accessresponse (RAR) by the base station to the wireless device. Msg3 is thescheduled transmission based on an uplink grant indicated in Msg2 andMsg4 may be for contention resolution.

The base station may transmit one or more RRC messages comprisingconfiguration parameters of the random access parameters. The randomaccess parameters may indicate radio resources (e.g., time-frequencyresources) for transmission of the random access preamble (e.g., Msg1),configuration index, one or more parameters for determining the power ofthe random access preamble (e.g., a power ramping parameter, a preamblereceived target power, etc.), a parameter indicating maximum number ofpreamble transmission, RAR window for monitoring RAR, cell-specificrandom access parameters and UE specific random access parameters. TheUE-specific random access parameters may indicate one or more PRACHoccasions for random access preamble (e.g., Msg1) transmissions. Therandom access parameters may indicate association between the PRACHoccasions and one or more reference signals (e.g., SSB or CSI-RS). Therandom access parameters may further indicate association between therandom access preambles and one or more reference signals (e.g., SBB orCSI-RS). The UE may use one or more reference signals (e.g., SSB(s) orCSI-RS(s)) and may determine a random access preamble to use for Msg1transmission based on the association between the random accesspreambles and the one or more reference signals. The UE may use one ormore reference signals (e.g., SSB(s) or CSI-RS(s)) and may determine thePRACH occasion to use for Msg1 transmission based on the associationbetween the PRACH occasions and the reference signals. The UE mayperform a retransmission of the random access preamble if no response isreceived with the RAR window following the transmission of the preamble.UE may use a higher transmission power for retransmission of thepreamble. UE may determine the higher transmission power of the preamblebased on the power ramping parameter.

Msg2 is for transmission of RAR by the base station. Msg2 may comprise aplurality of RARs corresponding to a plurality of random accesspreambles transmitted by a plurality of UEs. Msg2 may be associated witha random access temporary radio identifier (RA-RNTI) and may be receivedin a common search space of the UE. The RA-RNTI may be based on thePRACH occasion (e.g., time and frequency resources of a PRACH) in whicha random access preamble is transmitted. RAR may comprise a timingadvance command for uplink timing adjustment at the UE, an uplink grantfor transmission of Msg3 and a temporary C-RNTI. In response to thesuccessful reception of Msg2, the UE may transmit the Msg3. Msg3 andMsg4 may enable contention resolution in case of CBRA. In a CBRA, aplurality of UEs may transmit the same random access preamble and mayconsider the same RAR as being corresponding to them. UE may include adevice identifier in Msg3 (e.g., a C-RNTI, temporary C-RNTI or other UEidentity). Base station may transmit the Msg4 with a PDSCH and UE mayassume that the contention resolution is successful in response to thePDSCH used for transmission of Msg4 being associated with the UEidentifier included in Msg3.

FIG. 12B shows an example of a contention-free random access (CFRA)process. Msg 1 (random access preamble) and Msg 2 (random accessresponse) in FIG. 12B for CFRA may be analogous to Msg 1 and Msg 2 inFIG. 12A for CBRA. In an example, the CFRA procedure may be initiated inresponse to a PDCCH order from a base station. The PDCCH order forinitiating the CFRA procedure by the wireless device may be based on aDCI having a first format (e.g., format 1_0). The DCI for the PDCCHorder may comprise a random access preamble index, an UL/SUL indicatorindicating an uplink carrier of a cell (e.g., normal uplink carrier orsupplementary uplink carrier) for transmission of the random accesspreamble, a SS/PBCH index indicating the SS/PBCH that may be used todetermine a RACH occasion for PRACH transmission, a PRACH mask indexindicating the RACH occasion associated with the SS/PBCH indicated bythe SS/PBCH index for PRACH transmission, etc. In an example, the CFRAprocess may be started in response to a beam failure recovery process.The wireless device may start the CFRA for the beam failure recoverywithout a command (e.g., PDCCH order) from the base station and by usingthe wireless device dedicated resources.

FIG. 12C shows an example of a two-step random access process comprisingtwo messages exchanged between a wireless device and a base station. MsgA may be transmitted by the wireless device to the base station and maycomprise one or more transmissions of a preamble and/or one or moretransmissions of a transport block. The transport block in Msg A and Msg3 in FIG. 12A may have similar and/or equivalent contents. The transportblock of Msg A may comprise data and control information (e.g., SR, HARQfeedback, etc.). In response to the transmission of Msg A, the wirelessdevice may receive Msg B from the base station. Msg B in FIG. 12C andMsg 2 (e.g., RAR) illustrated in FIGS. 12A and 12B may have similarand/or equivalent content.

The base station may periodically transmit synchronization signals(SSs), e.g., primary SS (PSS) and secondary SS (SSS) along with PBCH oneach NR cell. The PSS/SSS together with PBCH is jointly referred to as aSS/PBCH block. The SS/PBCH block enables a wireless device to find acell when entering to the mobile communications network or find newcells when moving within the network. The SS/PBCH block spans four OFDMsymbols in time domain. The PSS is transmitted in the first symbol andoccupies 127 subcarriers in frequency domain. The SSS is transmitted inthe third OFDM symbol and occupies the same 127 subcarriers as the PSS.There are eight and nine empty subcarriers on each side of the SSS. ThePBCH is transmitted on the second OFDM symbol occupying 240 subcarriers,the third OFDM symbol occupying 48 subcarriers on each side of the SSS,and on the fourth OFDM symbol occupying 240 subcarriers. Some of thePBCH resources indicated above may be used for transmission of thedemodulation reference signal (DMRS) for coherent demodulation of thePBCH. The SS/PBCH block is transmitted periodically with a periodranging from 5 ms to 160 ms. For initial cell search or for cell searchduring inactive/idle state, a wireless device may assume that that theSS/PBCH block is repeated at least every 20 ms.

In NR, transmissions using of antenna arrays, with many antennaelements, and beamforming plays an important role specially in higherfrequency bands. Beamforming enables higher capacity by increasing thesignal strength (e.g., by focusing the signal energy in a specificdirection) and by lowering the amount interference received at thewireless devices. The beamforming techniques may generally be divided toanalog beamforming and digital beamforming techniques. With digitalbeamforming, signal processing for beamforming is carried out in thedigital domain before digital-to-analog conversion and detailed controlof both amplitude and phase of different antenna elements may bepossible. With analog beamforming, the signal processing for beamformingis carried out in the analog domain and after the digital to analogconversion. The beamformed transmissions may be in one direction at atime. For example, the wireless devices that are in different directionsrelative to the base station may receive their downlink transmissions atdifferent times. For analog receiver-side beamforming, the receiver mayfocus its receiver beam in one direction at a time.

In NR, the base station may use beam sweeping for transmission ofSS/PBCH blocks. The SS/PBCH blocks may be transmitted in different beamsusing time multiplexing. The set of SS/PBCH blocks that are transmittedin one beam sweep may be referred to as a SS/PBCH block set. The periodof PBCH/SSB block transmission may be a time duration between a SS/PBCHblock transmission in a beam and the next SS/PBCH block transmission inthe same beam. The period of SS/PBCH block is, therefore, also theperiod of the SS/PBCH block set.

FIG. 13A shows example time and frequency structure of SS/PBCH blocksand their associations with beams in accordance with several of variousembodiments of the present disclosure. In this example, a SS/PBCH block(also referred to as SSB) set comprise L SSBs wherein an SSB in the SSBset is associated with (e.g., transmitted in) one of L beams of a cell.The transmission of SBBs of an SSB set may be confined within a 5 msinterval, either in a first half-frame or a second half-frame of a 10 msframe. The number of SSBs in an SSB set may depend on the frequency bandof operation. For example, the number of SSBs in a SSB set may be up tofour SSBs in frequency bands below 3 GHz enabling beam sweeping of up tofour beams, up to eight SSBs in frequency bands between 3 GHz and 6 GHzenabling beam sweeping of up to eight beams, and up to sixty four SSBsin higher frequency bands enabling beam sweeping of up to sixty fourbeams. The SSs of an SSB may depend on a physical cell identity (PCI) ofthe cell and may be independent of which beam of the cell is used fortransmission of the SSB. The PBCH of an SSB may indicate a time indexparameter and the wireless device may determine the relative position ofthe SSB within the SSB set using the time index parameter. The wirelessdevice may use the relative position of the SSB within an SSB set fordetermining the frame timing and/or determining RACH occasions for arandom access process.

A wireless device entering the mobile communications network may firstsearch for the PSS. After detecting the PSS, the wireless device maydetermine the synchronization up to the periodicity of the PSS. Bydetecting the PSS, the wireless device may determine the transmissiontiming of the SSS. The wireless device may determine the PCI of the cellafter detecting the SSS. The PBCH of a SS/PBCH block is a downlinkphysical channel that carries the MIB. The MIB may be used by thewireless device to obtain remaining system information (RMSI) that isbroadcast by the network. The RMSI may include System Information Block1 (SIB1) that contains information required for the wireless device toaccess the cell.

As discussed earlier, the wireless device may determine a time indexparameter from the SSB. The PBCH comprises a half-frame parameterindicating whether the SSB is in the first 5 ms half or the second 5 mshalf of a 10 ms frame. The wireless device may determine the frameboundary using the time index parameter and the half-frame parameter. Inaddition, the PBCH may comprise a parameter indicating the system framenumber (SFN) of the cell.

The base station may transmit CSI-RS and a UE may measure the CSI-RS toobtain channel state information (CSI). The base station may configurethe CSI-RS in a UE-specific manner. In some scenarios, same set ofCSI-RS resources may be configured for multiple UEs and one or moreresource elements of a CSI-RS resource may be shared among multiple UEs.A CSI-RS resource may be configured such that it does not collide with aCORESET configured for the wireless device and/or with a DMRS of a PDSCHscheduled for the wireless device and/or transmitted SSBs. The UE maymeasure one or more CSI-RSs configured for the UE and may generate a CSIreport based on the CSI-RS measurements and may transmit the CSI reportto the base station for scheduling, link adaptation and/or otherpurposes.

NR supports flexible CSI-RS configurations. A CSI-RS resource may beconfigured with single or multiple antenna ports and with configurabledensity. Based on the number of configured antenna ports, a CSI-RSresource may span different number of OFDM symbols (e.g., 1, 2, and 4symbols). The CSI-RS may be configured for a downlink BWP and may usethe numerology of the downlink BWP. The CSI-RS may be configured tocover the full bandwidth of the downlink BWP or a portion of thedownlink BWP. In some case, the CSI-RS may be repeated in every resourceblock of the CSI-RS bandwidth, referred to as CSI-RS with density equalto one. In some cases, the CSI-RS may be configured to be repeated inevery other resource block of the CSI-RS bandwidth. CSI-RS may benon-zero power (NZP) CSI-RS or zero-power (ZP) CSI-RS.

The base station may configure a wireless device with one or more setsof NZP CSI-RS resources. The base station may configure the wirelessdevice with a NZP CSI-RS resource set using an RRC information element(IE) NZP-CSI-RS-ResourceSet indicating a NZP CSI-RS resource setidentifier (ID) and parameters specific to the NZP CSI-RS resource set.An NZP CSI-RS resource set may comprise one or more CSI-RS resources. AnNZP CSI-RS resource set may be configured as part of the CSI measurementconfiguration.

The CSI-RS may be configured for periodic, semi-persistent or aperiodictransmission. In case of the periodic and semi-persistent CSI-RSconfigurations, the wireless device may be configured with a CSIresource periodicity and offset parameter that indicate a periodicityand corresponding offset in terms of number of slots. The wirelessdevice may determine the slots that the CSI-RSs are transmitted. Forsemi-persistent CSI-RS, the CSI-RS resources for CSI-RS transmissionsmay be activated and deactivated by using a semi-persistent (SP) CSI-CSIResource Set Activation/Deactivation MAC CE. In response to receiving aMAC CE indicating activation of semi-persistent CSI-RS resources, thewireless device may assume that the CSI-RS transmissions will continueuntil the CSI-RS resources for CSI-RS transmissions are activated.

As discussed before, CSI-RS may be configured for a wireless device asNZP CSI-RS or ZP CSI-RS. The configuration of the ZP CSI-RS may besimilar to the NZP CSI-RS with the difference that the wireless devicemay not carry out measurements for the ZP CSI-RS. By configuring ZPCSI-RS, the wireless device may assume that a scheduled PDSCH thatincludes resource elements from the ZP CSI-RS is rate matched aroundthose ZP CSI-RS resources. For example, a ZP CSI-RS resource configuredfor a wireless device may be an NZP CSI-RS resource for another wirelessdevice. For example, by configuring ZP CSI-RS resources for the wirelessdevice, the base station may indicate to the wireless device that thePDSCH scheduled for the wireless device is rate matched around the ZPCSI-RS resources.

A base station may configure a wireless device with channel stateinformation interference measurement (CSI-IM) resources. Similar to theCSI-RS configuration, configuration of locations and density of CSI-IMresources may be flexible. The CSI-IM resources may be periodic(configured with a periodicity), semi-persistent (configured with aperiodicity and activated and deactivated by MAC CE) or aperiodic(triggered by a DCI).

Tracking reference signals (TRSs) may be configured for a wirelessdevice as a set of sparse reference signals to assist the wireless intime and frequency tracking and compensating time and frequencyvariations in its local oscillator. The wireless device may further usethe TRSs for estimating channel characteristics such as delay spread ordoppler frequency. The base station may use a CSI-RS configuration forconfiguring TRS for the wireless device. The TRS may be configured as aresource set comprising multiple periodic NZP CSI-RS resources.

A base station may configure a UE and the UE may transmit soundingreference signals (SRSs) to enable uplink channel sounding/estimation atthe base station. The SRS may support up to four antenna ports and maybe designed with low cubic metric enabling efficient operation of thewireless device amplifier. The SRS may span one or more (e.g., one, twoor four) consecutive OFDM symbols in time domain and may be locatedwithin the last n (e.g., six) symbols of a slot. In the frequencydomain, the SRS may have a structure that is referred to as a combstructure and may be transmitted on every Nth subcarrier. Different SRStransmissions from different wireless devices may have different combstructures and may be multiplexed in frequency domain.

A base station may configure a wireless device with one or more SRSresource sets and an SRS resource set may comprise one or more SRSresources. The SRS resources in an SRS resources set may be configuredfor periodic, semi-persistent or aperiodic transmission. The periodicSRS and the semi-persistent SRS resources may be configured withperiodicity and offset parameters. The Semi-persistent SRS resources ofa configured semi-persistent SRS resource set may be activated ordeactivated by a semi-persistent (SP) SRS Activation/Deactivation MACCE. The set of SRS resources included in an aperiodic SRS resource setmay be activated by a DCI. A value of a field (e.g., an SRS requestfield) in the DCI may indicate activation of resources in an aperiodicSRS resource set from a plurality of SRS resource sets configured forthe wireless device.

An antenna port may be associated with one or more reference signals.The receiver may assume that the one or more reference signals,associated with the antenna port, may be used for estimating channelcorresponding to the antenna port. The reference signals may be used toderive channel state information related to the antenna port. Twoantenna ports may be referred to as quasi co-located if characteristics(e.g., large-scale properties) of the channel over which a symbol isconveyed on one antenna port may be inferred from the channel over whicha symbol is conveyed from another antenna port. For example, a UE mayassume that radio channels corresponding to two different antenna portshave the same large-scale properties if the antenna ports are specifiedas quasi co-located. In some cases, the UE may assume that two antennaports are quasi co-located based on signaling received from the basestation. Spatial quasi-colocation (QCL) between two signals may be, forexample, due to the two signals being transmitted from the same locationand in the same beam. If a receive beam is good for a signal in a groupof signals that are spatially quasi co-located, it may be assumed alsobe good for the other signals in the group of signals.

The CSI-RS in the downlink and the SRS in uplink may serve asquasi-location (QCL) reference for other physical downlink channels andphysical uplink channels, respectively. For example, a downlink physicalchannel (e.g., PDSCH or PDCCH) may be spatially quasi co-located with adownlink reference signal (e.g., CSI-RS or SSB). The wireless device maydetermine a receive beam based on measurement on the downlink referencesignal and may assume that the determined received beam is also good forreception of the physical channels (e.g., PDSCH or PDCCH) that arespatially quasi co-located with the downlink reference signal.Similarly, an uplink physical channel (e.g., PUSCH or PUCCH) may bespatially quasi co-located with an uplink reference signal (e.g., SRS).The base station may determine a receive beam based on measurement onthe uplink reference signal and may assume that the determined receivedbeam is also good for reception of the physical channels (e.g., PUSCH orPUCCH) that are spatially quasi co-located with the uplink referencesignal.

The Demodulation Reference Signals (DM-RSs) enables channel estimationfor coherent demodulation of downlink physical channels (e.g., PDSCH,PDCCH and PBH) and uplink physical channels (e.g., PUSCH and PUCCH). TheDM-RS may be located early in the transmission (e.g., front-loadedDM-RS) and may enable the receiver to obtain the channel estimate earlyand reduce the latency. The time-domain structure of the DM-RS (e.g.,symbols wherein the DM-RS are located in a slot) may be based ondifferent mapping types.

The Phase Tracking Reference Signals (PT-RSs) enables tracking andcompensation of phase variations across the transmission duration. Thephase variations may be, for example, due to oscillator phase noise. Theoscillator phase noise may become more sever in higher frequencies(e.g., mmWave frequency bands). The base station may configure the PT-RSfor uplink and/or downlink. The PT-RS configuration parameters mayindicate frequency and time density of PT-RS, maximum number of ports(e.g., uplink ports), resource element offset, configuration of uplinkPT-RS without transform precoder (e.g., CP-OFDM) or with transformprecoder (e.g., DFT-s-OFDM), etc. The subcarrier number and/or resourceblocks used for PT-RS transmission may be based on the C-RNTI of thewireless device to reduce risk of collisions between PT-RSs of wirelessdevices scheduled on overlapping frequency domain resources.

FIG. 13B shows example time and frequency structure of CSI-RSs and theirassociation with beams in accordance with several of various embodimentsof the present disclosure. A beam of the L beams shown in FIG. 13B maybe associated with a corresponding CSI-RS resource. The base station maytransmit the CSI-RSs using the configured CSI-RS resources and a UE maymeasure the CSI-RSs (e.g., received signal received power (RSRP) of theCSI-RSs) and report the CSI-RS measurements to the base station based ona reporting configuration. For example, the base station may determineone or more transmission configuration indication (TCI) states and mayindicate the one or more TCI states to the UE (e.g., using RRCsignaling, a MAC CE and/or a DCI). Based on the one or more TCI statesindicated to the UE, the UE may determine a downlink receive beam andreceive downlink transmissions using the receive beam. In case of a beamcorrespondence, the UE may determine a spatial domain filter of atransmit beam based on spatial domain filter of a corresponding receivebeam. Otherwise, the UE may perform an uplink beam selection procedureto determine the spatial domain filter of the transmit beam. The UE maytransmit one or more SRSs using the SRS resources configured for the UEand the base station may measure the SRSs and determine/select thetransmit beam for the UE based the SRS measurements. The base stationmay indicate the selected beam to the UE. The CSI-RS resources shown inFIG. 13B may be for one UE. The base station may configure differentCSI-RS resources associated with a given beam for different UEs by usingfrequency division multiplexing.

A base station and a wireless device may perform beam managementprocedures to establish beam pairs (e.g., transmit and receive beams)that jointly provide good connectivity. For example, in the downlinkdirection, the UE may perform measurements for a beam pair and estimatechannel quality for a transmit beam by the base station (or atransmission reception point (TRP) more generally) and the receive beamby the UE. The UE may transmit a report indicating beam pair qualityparameters. The report may comprise one or more parameters indicatingone or more beams (e.g., a beam index, an identifier of reference signalassociated with a beam, etc.), one or more measurement parameters (e.g.,RSRP), a precoding matrix indicator (PMI), a channel quality indicator(CQI), and/or a rank indicator (RI).

FIG. 14A, FIG. 14B and FIG. 14C show example beam management processes(referred to as P1, P2 and P3, respectively) in accordance with severalof various embodiments of the present disclosure. The P1 process shownin FIG. 14A may enable, based on UE measurements, selection of a basestation (or TRP more generally) transmit beam and/or a wireless devicereceive beam. The TRP may perform a beam sweeping procedure where theTRP may sequentially transmit reference signals (e.g., SSB and/orCSI-RS) on a set of beams and the UE may select a beam from the set ofbeams and may report the selected beam to the TRP. The P2 procedure asshown in FIG. 14B may be a beam refinement procedure. The selection ofthe TRP transmit beam and the UE receive beam may be regularlyreevaluated due to movements and/or rotations of the UE or movement ofother objects. In an example, the base station may perform the beamsweeping procedure over a smaller set of beams and the UE may select thebest beam over the smaller set. In an example, the beam shape may benarrower compared to beam selected based on the P1 procedure. Using theP3 procedure as shown in FIG. 14C, the TRP may fix its transmit beam andthe UE may refine its receive beam.

A wireless device may receive one or more messages from a base station.The one or more messages may comprise one or more RRC messages. The oneor more messages may comprise configuration parameters of a plurality ofcells for the wireless device. The plurality of cells may comprise aprimary cell and one or more secondary cells. For example, the pluralityof cells may be provided by a base station and the wireless device maycommunicate with the base station using the plurality of cells. Forexample, the plurality of cells may be provided by multiple base station(e.g., in case of dual and/or multi-connectivity). The wireless devicemay communicate with a first base station, of the multiple basestations, using one or more first cells of the plurality of cells. Thewireless device may communicate with a second base station of themultiple base stations using one or more second cells of the pluralityof cells.

The one or more messages may comprise configuration parameters used forprocesses in physical, MAC, RLC, PCDP, SDAP, and/or RRC layers of thewireless device. For example, the configuration parameters may includevalues of timers used in physical, MAC, RLC, PCDP, SDAP, and/or RRClayers. For example, the configuration parameters may include parametersfor configurating different channels (e.g., physical layer channel,logical channels, RLC channels, etc.) and/or signals (e.g., CSI-RS, SRS,etc.).

Upon starting a timer, the timer may start running until the timer isstopped or until the timer expires. A timer may be restarted if it isrunning. A timer may be started if it is not running (e.g., after thetimer is stopped or after the timer expires). A timer may be configuredwith or may be associated with a value (e.g., an initial value). Thetimer may be started or restarted with the value of the timer. The valueof the timer may indicate a time duration that the timer may be runningupon being started or restarted and until the timer expires. Theduration of a timer may not be updated until the timer is stopped orexpires (e.g., due to BWP switching). This specification may disclose aprocess that includes one or more timers. The one or more timers may beimplemented in multiple ways. For example, a timer may be used by thewireless device and/or base station to determine a time window [t1, t2],wherein the timer is started at time t1 and expires at time t2 and thewireless device and/or the base station may be interested in and/ormonitor the time window [t1, t2], for example to receive a specificsignaling. Other examples of implementation of a timer may be provided.

FIG. 15 shows example components of a wireless device and a base stationthat are in communication via an air interface in accordance withseveral of various embodiments of the present disclosure. The wirelessdevice 1502 may communicate with the base station 1542 over the airinterface 1532. The wireless device 1502 may include a plurality ofantennas. The base station 1542 may include a plurality of antennas. Theplurality of antennas at the wireless device 1502 and/or the basestation 1542 enables different types of multiple antenna techniques suchas beamforming, single-user and/or multi-user MIMO, etc.

The wireless device 1502 and the base station 1542 may have one or moreof a plurality of modules/blocks, for example RF front end (e.g., RFfront end 1530 at the wireless device 1502 and RF front end 1570 at thebase station 1542), Data Processing System (e.g., Data Processing System1524 at the wireless device 1502 and Data Processing System 1564 at thebase station 1542), Memory (e.g., Memory 1512 at the wireless device1502 and Memory 1542 at the base station 1542). Additionally, thewireless device 1502 and the base station 1542 may have othermodules/blocks such as GPS (e.g., GPS 1514 at the wireless device 1502and GPS 1554 at the base station 1542).

An RF front end module/block may include circuitry between antennas anda Data Processing System for proper conversion of signals between thesetwo modules/blocks. An RF front end may include one or more filters(e.g., Filter(s) 1526 at RF front end 1530 or Filter(s) 1566 at the RFfront end 1570), one or more amplifiers (e.g., Amplifier(s) 1528 at theRF front end 1530 and Amplifier(s) 1568 at the RF front end 1570). TheAmplifier(s) may comprise power amplifier(s) for transmission andlow-noise amplifier(s) (LNA(s)) for reception.

The Data Processing System 1524 and the Data Processing System 1564 mayprocess the data to be transmitted or the received signals byimplementing functions at different layers of the protocol stack such asPHY, MAC, RLC, etc. Example PHY layer functions that may be implementedby the Data Processing System 1524 and/or 1564 may include forward errorcorrection, interleaving, rate matching, modulation, precoding, resourcemapping, MIMO processing, etc. Similarly, one or more functions of theMAC layer, RLC layer and/or other layers may be implemented by the DataProcessing System 1524 and/or the Data Processing System 1564. One ormore processes described in the present disclosure may be implemented bythe Data Processing System 1524 and/or the Data Processing System 1564.A Data Processing System may include an RF module (RF module 1516 at theData Processing System 1524 and RF module 1556 at the Data ProcessingSystem 1564) and/or a TX/RX processor (e.g., TX/RX processor 1518 at theData Processing System 1524 and TX/RX processor 1558 at the DataProcessing System 1566) and/or a central processing unit (CPU) (e.g.,CPU 1520 at the Data Processing System 1524 and CPU 1560 at the DataProcessing System 1564) and/or a graphical processing unit (GPU) (e.g.,GPU 1522 at the Data Processing System 1524 and GPU 1562 at the DataProcessing System 1564).

The Memory 1512 may have interfaces with the Data Processing System 1524and the Memory 1552 may have interfaces with Data Processing System1564, respectively. The Memory 1512 or the Memory 1552 may includenon-transitory computer readable mediums (e.g., Storage Medium 1510 atthe Memory 1512 and Storage Medium 1550 at the Memory 1552) that maystore software code or instructions that may be executed by the DataProcessing System 1524 and Data Processing System 1564, respectively, toimplement the processes described in the present disclosure. The Memory1512 or the Memory 1552 may include random-access memory (RAM) (e.g.,RAM 1506 at the Memory 1512 or RAM 1546 at the Memory 1552) or read-onlymemory (ROM) (e.g., ROM 1508 at the Memory 1512 or ROM 1548 at theMemory 1552) to store data and/or software codes.

The Data Processing System 1524 and/or the Data Processing System 1564may be connected to other components such as a GPS module 1514 and a GPSmodule 1554, respectively, wherein the GPS module 1514 and a GPS module1554 may enable delivery of location information of the wireless device1502 to the Data Processing System 1524 and location information of thebase station 1542 to the Data Processing System 1564. One or more otherperipheral components (e.g., Peripheral Component(s) 1504 or PeripheralComponent(s) 1544) may be configured and connected to the dataProcessing System 1524 and data Processing System 1564, respectively.

In example embodiments, a wireless device may be configured withparameters and/or configuration arrangements. For example, theconfiguration of the wireless device with parameters and/orconfiguration arrangements may be based on one or more control messagesthat may be used to configure the wireless device to implement processesand/or actions. The wireless device may be configured with theparameters and/or the configuration arrangements regardless of thewireless device being in operation or not in operation. For example,software, firmware, memory, hardware and/or a combination thereof and/oralike may be configured in a wireless device regardless of the wirelessdevice being in operation or not operation. The configured parametersand/or settings may influence the actions and/or processes performed bythe wireless device when in operation.

In example embodiments, a wireless device may receive one or moremessage comprising configuration parameters. For example, the one ormore messages may comprise radio resource control (RRC) messages. Aparameter of the configuration parameters may be in at least one of theone or more messages. The one or more messages may comprise informationelement (IEs). An information element may be a structural element thatincludes single or multiple fields. The fields in an IE may beindividual contents of the IE. The terms configuration parameter, IE andfield may be used equally in this disclosure. The IEs may be implementedusing a nested structure, wherein an IE may include one or more otherIEs and an IE of the one or more other IEs may include one or moreadditional IEs. With this structure, a parent IE contains all theoffspring IEs as well. For example, a first IE containing a second IE,the second IE containing a third IE, and the third IE containing afourth IE may imply that the first IE contains the third IE and thefourth IE.

In an example, an IE PDSCH-ServingCellConfig may be used to configure UEspecific PDSCH parameters that may be common across the UE's BWPs of aserving cell. In an example, the PDSCH-ServingCellConfig IE may comprisea pucch-Cell field an ID of a serving cell (e.g., of the same cellgroup) to use for PUCCH. If the field is absent, the UE may send theHARQ feedback on the PUCCH of the SpCell of this cell group, or on thisserving cell if it is a PUCCH SCell. In an example, the field is alsoabsent for the SpCells as well as for a PUCCH SCell.

In an example, if a UE reports HARQ-ACK information in a PUCCH only fora SPS PDSCH release indicated by DCI format 1_0 with counter downlinkassignment indicator (DAI) field value of 1, or a PDSCH receptionscheduled by DCI format 1_0 with counter DAI field value of 1 on thePCell, or SPS PDSCH reception(s) within the M_(A,c) occasions forcandidate PDSCH receptions, the UE may determine a HARQ-ACK codebookonly for the SPS PDSCH release or only for the PDSCH reception or onlyfor one SPS PDSCH reception according to corresponding M_(A,c)occasion(s) on respective serving cell(s), where the HARQ-ACKinformation bits in response to more than one SPS PDSCH receptions thatthe UE is configured to receive may be ordered according to an exampleprocess. The UE may set N_(cells) ^(DL) to the number of serving cellsconfigured to the UE. The UE may set N_(c) ^(SPS) to the number of SPSPDSCH configuration configured to the UE for serving cell c. The UE mayset N_(c) ^(DL) to the number of DL slots for SPS PDSCH reception onserving cell c with HARQ-ACK information multiplexed on the PUCCH. TheUE may set j=0−HARQ-ACK information bit index. The UE may setc=0−serving cell index: lower indexes may correspond to lower RRCindexes of corresponding cell. While c<N_(cells) ^(DL), the UE may sets=0−SPS PDSCH configuration index: lower indexes may correspond to lowerRRC indexes of corresponding SPS configurations. While s<N_(c) ^(SPS),the UE may set n_(D)=0−slot index. While n_(D)<N_(c) ^(DL), if a UE isconfigured to receive a SPS PDSCH in slot n_(D) for SPS PDSCHconfiguration s on serving cell c, excluding SPS PDSCH that is notrequired to be received among overlapping SPS PDSCHs, or based on a UEcapability for a number of PDSCH receptions in a slot, or due tooverlapping with a set of symbols indicated as uplink bytdd-UL-DL-ConfigurationCommon or by tdd-UL-DL-ConfigurationDedicated,and HARQ-ACK information for the SPS PDSCH is associated with the PUCCH,the j-th HARQ feedback in the codebook may be the HARQ-ACK informationbit for this SPS PDSCH reception.

In an example, if a UE is configured to receive SPS PDSCH and the UEmultiplexes HARQ-ACK information for one activated SPS PDSCH receptionin the PUCCH in slot n, the UE may generate one HARQ-ACK information bitassociated with the SPS PDSCH reception and may append it to the O^(ACK)HARQ-ACK information bits.

In an example, if a UE is configured to receive SPS PDSCH and the UEmultiplexes HARQ-ACK information for multiple activated SPS PDSCHreceptions in the PUCCH in slot n, the UE may generate the HARQ-ACKinformation and may append it to the O^(ACK) HARQ-ACK information bits.

In an example, a DCI scheduling a downlink transport block may comprisea field (e.g., a One-shot HARQ-ACK request) indicating a transmission ofa HARQ feedback codebook (e.g., for a number of transport blocks and/orfor all HARQ processes).

In an example, if a UE is provided with an information element (e.g., apdsch-HARQ-ACK-OneShotFeedback) and the UE detects a DCI format in anyPDCCH monitoring occasion that includes a One-shot HARQ-ACK requestfield with value 1, the UE may include the HARQ-ACK information in aHARQ-ACK codebook (e.g., a Type-3 codebook). In an example, the UE maynot expect that the PDSCH-to-HARQ_feedback timing indicator field of theDCI format provides an inapplicable value from dl-DataToUL-ACK.

In an example, the IE SPS-Config may be used to configure downlinksemi-persistent transmission. Multiple Downlink SPS configurations maybe configured in one BWP of a serving cell. A parameter harq-CodebookIDmay indicate the HARQ-ACK codebook index for the corresponding HARQ-ACKcodebook for SPS PDSCH and ACK for SPS PDSCH release. A parameterharq-ProcID-Offset may indicate the offset used in deriving the HARQprocess IDs. A parameter nrofHARQ-Processes may indicate number ofconfigured HARQ processes for SPS DL. A parameter n1PUCCH-AN mayindicate HARQ resource for PUCCH for DL SPS. The network may configurethe resource as format0 or format1. The PUCCH-Resource may be configuredin PUCCH-Config and referred to by its ID. A parameter periodicityExtmay be used to calculate the periodicity for DL SPS. If this field ispresent, the field periodicity may be ignored. A parametersps-ConfigIndexI may indicate the index of one of multiple SPSconfigurations.

In an example, the IE SPS-ConfigIndex may be used to indicate the indexof one of multiple DL SPS configurations in one BWP.

In an example, the IE SPS-PUCCH-AN may be used to indicate a PUCCHresource for HARQ ACK and configure the corresponding maximum payloadsize for the PUCCH resource. In an example, the parameter maxPayloadSizemay indicate the maximum payload size for the corresponding PUCCHresource ID. In an example, the parameter sps-PUCCH-AN-ResourceID mayindicate the PUCCH resource ID.

In an example, the IE SPS-PUCCH-AN-List may be used to configure thelist of PUCCH resources per HARQ ACK codebook.

In an example, for configured downlink assignments withoutharq-ProcID-Offset, the HARQ Process ID associated with the slot wherethe DL transmission starts may be derived from the following equation:HARQ Process ID=[floor(CURRENT_slot×10/(numberOfSlotsPerFrame×periodicity))] modulonrofHARQ-Processes

where CURRENT_slot=[(SFN×numberOfSlotsPerFrame)+slot number in theframe] and numberOfSlotsPerFrame may refer to the number of consecutiveslots per frame.

In an example, for configured downlink assignments withharq-ProcID-Offset, the HARQ Process ID associated with the slot wherethe DL transmission starts may be derived from the following equation:HARQ Process ID=[floor (CURRENT_slot/periodicity)] modulonrofHARQ-Processes+harq-ProcID-Offset

where CURRENT_slot=[(SFN×numberOfSlotsPerFrame)+slot number in theframe] and numberOfSlotsPerFrame may refer to the number of consecutiveslots per frame.

In an example, Semi-Persistent Scheduling (SPS) may be configured by RRCper Serving Cell and per BWP. Multiple assignments may be activesimultaneously in the same BWP. Activation and deactivation of the DLSPS may be independent among the Serving Cells.

In an example, for the DL SPS, a DL assignment may be provided by PDCCH,and stored or cleared based on L1 signaling indicating SPS activation ordeactivation.

In an example, RRC may configure the following parameters when the SPSis configured: cs-RNTI: CS-RNTI for activation, deactivation, andretransmission; nrofHARQ-Processes: the number of configured HARQprocesses for SPS; harq-ProcID-Offset: Offset of HARQ process for SPS;and periodicity: periodicity of configured downlink assignment for SPS.

In an example, when the SPS is released by upper layers, thecorresponding configurations may be released.

In an example, after a downlink assignment is configured for SPS, theMAC entity may consider sequentially that the Nth downlink assignmentoccurs in the slot for which: (numberOfSlotsPerFrame×SFN+slot number inthe frame)=[(numberOfSlotsPerFrame×SFNstart time+slotstarttime)+N×periodicity×numberOfSlotsPerFrame/10] modulo(1024×numberOfSlotsPerFrame)

where SFNstart time and slotstart time may be the SFN and slot,respectively, of the first transmission of PDSCH where the configureddownlink assignment was (re-)initialized.

In an example, the MAC entity of a wireless device may be configured byRRC with a discontinuous reception (DRX) functionality that may controlthe UE's PDCCH monitoring activity for one or more of the MAC entity'sRNTIs (e.g., C-RNTI, CI-RNTI, CS-RNTI, INT-RNTI, SFI-RNTI, SP-CSI-RNTI,TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, TPC-SRS-RNTI, and AI-RNTI).

In an example, RRC may control DRX operation by configuring thefollowing parameters: drx-onDurationTimer: the duration at the beginningof a DRX Cycle; drx-SlotOffset: the delay before starting thedrx-onDurationTimer; drx-InactivityTimer: the duration after the PDCCHoccasion in which a PDCCH indicates a new UL or DL transmission for theMAC entity; drx-RetransmissionTimerDL (per DL HARQ process except forthe broadcast process): the maximum duration until a DL retransmissionis received; drx-RetransmissionTimerUL (per UL HARQ process): themaximum duration until a grant for UL retransmission is received;drx-LongCycleStartOffset: the Long DRX cycle and drx-StartOffset whichdefines the subframe where the Long and Short DRX Cycle starts;drx-ShortCycle (optional): the Short DRX cycle; drx-ShortCycleTimer(optional): the duration the UE shall follow the Short DRX cycle;drx-HARQ-RTT-TimerDL (per DL HARQ process except for the broadcastprocess): the minimum duration before a DL assignment for HARQretransmission is expected by the MAC entity; drx-HARQ-RTT-TimerUL (perUL HARQ process): the minimum duration before a UL HARQ retransmissiongrant is expected by the MAC entity.

In an example, serving Cells may be configured by RRC in two groups.When RRC does not configure a secondary DRX group, there may be only oneDRX group. When two DRX groups are configured each group of ServingCells, which is called a DRX group, is configured by RRC with its ownset of parameters: drx-onDurationTimer, drx-InactivityTimer. When twoDRX groups are configured, the two groups may share the followingparameter values: drx-SlotOffset, drx-RetransmissionTimerDL,drx-RetransmissionTimerUL, drx-LongCycleStartOffset, drx-ShortCycle(optional), drx-ShortCycleTimer (optional), drx-HARQ-RTT-TimerDL, anddrx-HARQ-RTT-TimerUL.

In an example, when a DRX cycle is configured, the Active Time forServing Cells in a DRX group may include the time while:drx-onDurationTimer or drx-InactivityTimer configured for the DRX groupis running; or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL isrunning on any Serving Cell in the DRX group; orra-ContentionResolutionTimer or msgB-ResponseWindow is running; or aScheduling Request is sent on PUCCH and is pending; or a PDCCHindicating a new transmission addressed to the C-RNTI of the MAC entityhas not been received after successful reception of a Random AccessResponse for the Random Access Preamble not selected by the MAC entityamong the contention-based Random Access Preamble.

In an example, when DRX is configured, if a MAC PDU is received in aconfigured downlink assignment: the MAC entity may start thedrx-HARQ-RTT-TimerDL for the corresponding HARQ process in the firstsymbol after the end of the corresponding transmission carrying the DLHARQ feedback; and stop the drx-RetransmissionTimerDL for thecorresponding HARQ process.

In an example, when DRX is configured, if a MAC PDU is transmitted in aconfigured uplink grant and listen before talk (LBT) failure indicationis not received from lower layers: the MAC entity may start thedrx-HARQ-RTT-TimerUL for the corresponding HARQ process in the firstsymbol after the end of the first repetition of the corresponding PUSCHtransmission; and stop the drx-RetransmissionTimerUL for thecorresponding HARQ process.

In an example, when DRX is configured, if a drx-HARQ-RTT-TimerDLexpires: if the data of the corresponding HARQ process was notsuccessfully decoded: the MAC entity may start thedrx-RetransmissionTimerDL for the corresponding HARQ process in thefirst symbol after the expiry of drx-HARQ-RTT-TimerDL.

In an example, when DRX is configured, if a drx-HARQ-RTT-TimerULexpires: the MAC entity may start the drx-RetransmissionTimerUL for thecorresponding HARQ process in the first symbol after the expiry ofdrx-HARQ-RTT-TimerUL.

In an example, for a DRX group, if a DRX Command MAC CE or a Long DRXCommand MAC CE is received: the MAC entity may stop drx-onDurationTimer;and stop drx-InactivityTimer.

In an example, for a DRX group, if drx-InactivityTimer for this DRXGroup expires: if the Short DRX cycle is configured: the MAC entity maystart or restart drx-ShortCycleTimer for this DRX Group in the firstsymbol after the expiry of drx-InactivityTimer; and use the Short DRXCycle for this DRX group.

In an example, for a DRX group, if drx-InactivityTimer for this DRXGroup expires: if the Short DRX cycle is not configured: the MAC entitymay use the Long DRX cycle for this DRX group.

In an example, for a DRX group, if a DRX Command MAC CE is received: ifthe Short DRX cycle is configured: the MAC entity may start or restartdrx-ShortCycleTimer for this DRX Group in the first symbol after the endof DRX Command MAC CE reception; and use the Short DRX Cycle for bothDRX groups.

In an example, for a DRX group, if a DRX Command MAC CE is received: ifthe Short DRX cycle is not configured: the MAC entity may use the LongDRX cycle for both DRX groups.

In an example, for a DRX group, if drx-ShortCycleTimer for this DRXGroup expires: the MAC entity may use the Long DRX for this DRX Groupcycle.

In an example, for a DRX group, if a Long DRX Command MAC CE isreceived: the MAC entity may stop drx-ShortCycleTimer for both DRXgroups; and use the Long DRX cycle for both DRX groups.

In an example, for a DRX group, if the Short DRX Cycle is used, and[(SFN×10)+subframe number] modulo (drx-ShortCycle)=(drx-StartOffset)modulo (drx-ShortCycle): the MAC entity may start drx-onDurationTimerafter drx-SlotOffset from the beginning of the subframe.

In an example, for a DRX group, if the Long DRX Cycle is used, and[(SFN×10)+subframe number] modulo (drx-LongCycle)=drx-StartOffset: theMAC entity may start drx-onDurationTimer after drx-SlotOffset from thebeginning of the subframe.

In an example, for a DRX group, if the DRX group is in Active Time: theMAC entity may monitor the PDCCH on the Serving Cells in this DRX group.If the PDCCH indicates a DL transmission: the MAC entity may start thedrx-HARQ-RTT-TimerDL for the corresponding HARQ process in the firstsymbol after the end of the corresponding transmission carrying the DLHARQ feedback. In an example, when HARQ feedback is postponed byPDSCH-to-HARQ_feedback timing indicating a non-numerical k1 value, thecorresponding transmission opportunity to send the DL HARQ feedback maybe indicated in a later PDCCH requesting the HARQ-ACK feedback. The MACentity may stop the drx-RetransmissionTimerDL for the corresponding HARQprocess. If the PDSCH-to-HARQ_feedback timing indicates a non-numericalk1 value, the MAC entity may start the drx-RetransmissionTimerDL in thefirst symbol after the PDSCH transmission for the corresponding HARQprocess.

In an example, for a DRX group, if the DRX group is in Active Time: theMAC entity may monitor the PDCCH on the Serving Cells in this DRX group.If the PDCCH indicates a UL transmission: the MAC entity may start thedrx-HARQ-RTT-TimerUL for the corresponding HARQ process in the firstsymbol after the end of the first repetition of the corresponding PUSCHtransmission; and the MAC entity may stop the drx-RetransmissionTimerULfor the corresponding HARQ process.

In an example, for a DRX group, if the DRX group is in Active Time: theMAC entity may monitor the PDCCH on the Serving Cells in this DRX group.If the PDCCH indicates a new transmission (DL or UL) on a Serving Cellin this DRX group: the MAC entity may start or restartdrx-InactivityTimer for this DRX group in the first symbol after the endof the PDCCH reception.

In an example, DCI format 1_0 may be used for the scheduling of PDSCH inone DL cell. The DCI may indicate Modulation and coding scheme; New dataindicator; Redundancy version; HARQ process number; TPC command forscheduled PUCCH; PUCCH resource indicator; Pand DSCH-to-HARQ_feedbacktiming indicator.

In an example, DCI format 1_1 may be used for the scheduling of PDSCH inone cell. The DCI may indicate Carrier indicator; Bandwidth partindicator; Frequency domain resource assignment; Time domain resourceassignment; HARQ process number; TPC command for scheduled PUCCH; PUCCHresource indicator; PDSCH-to-HARQ_feedback timing indicator; Modulationand coding scheme.

In an example, DCI format 1_2 may be used for the scheduling of PDSCH inone cell. The DCI may indicate Carrier indicator; Bandwidth partindicator; Frequency domain resource assignment; Time domain resourceassignment; Modulation and coding scheme; New data indicator; Redundancyversion; HARQ process number; TPC command for scheduled PUCCH; PUCCHresource indicator; and PDSCH-to-HARQ_feedback timing indicator.

In an example, the SPS PDSCHs associated with an SPS configuration mayhave a fixed PDSCH-to-HARQ timing (e.g., denoted as K1) as indicated byan activation DCI indicating activation of the SPS configuration. In anexample, with shorter (e.g., down to 1 slot) SPS periodicities, a largenumber of the SPS HARQ-ACK feedback may be dropped if the correspondingPUCCH resource collides with at least 1 DL or flexible symbol (e.g., ina TDD scenario).

In an example, an SPS HARQ feedback may be transmitted in a later PUCCH.In an example, a HARQ feedback for a downlink transport block may bedropped at its scheduled timing and may be deferred until a later PUCCHresource (e.g., a first/earliest available valid PUCCH resource). In anexample, a valid PUCCH resource may be a PUCCH resource that does notcollide with a DL or flexible symbol. In an example, a timing of thelater PUCCH resource may be further limited to the maximum configured K1value from a K1 set. In an example, the UE may discard the HARQ feedbackinformation, if the UE cannot transmit the HARQ feedback informationwithin the configured maximum HARQ-ACK feedback delay.

In an example, the base station may dynamically indicate one or moretransmission opportunities for a postponed HARQ feedback to the UE.

In an example, the UE may receive a configuration parameter (e.g., anRRC parameter) indicating a time window, wherein the time window may beused for a K1 value used for determining HARQ feedback of a SPStransmission.

In an example, a UE may transmit HARQ feedbacks for a for group of SPSHARQ processes based on a one-shot HARQ feedback request. In an example,a non-numerical K1 value (e.g., a NN k1) for DL SPS operation inlicensed spectrum. In an example, a UE may select a first applicable k1value from a set of configured K1 values.

In an example, based on intra-UE and/or inter-UE prioritization, lowpriority HARQ feedback transmission may be dropped/canceled due tooverlapping high priority UL channels (e.g., for intra-UEprioritization) or due to UL cancelation indication (e.g., using DCIformat 2_4), for example, for HARQ feedback carried on PUSCH. This maylead to low priority HARQ feedback dropping affecting the eMBB PDSCHperformance (from single UE but especially from cell load perspective)which may be improved by allowing a later re-transmission ofcanceled/dropped low priority HARQ feedback.

In an example, the dropped/canceled HARQ feedback transmission due tointra-UE or inter-UE prioritization may be enhanced by re-transmissionof HARQ feedback.

In an example, the gNB may indicate a new PUCCH resource forre-transmission of the dropped/cancelled HARQ feedback.

In an example, more than one PUCCH transmission for HARQ feedback withinone slot may be enabled by sub-slot based HARQ feedback transmission. Inan example, a plurality of HARQ feedback codebooks with differentpriorities may be simultaneously constructed.

In an example, HARQ feedback for SPS may be dropped when it collideswith symbols that cannot be used for uplink transmission. In unpairedspectrum, DL heavy configurations and multiple SPS configurations willcause HARQ feedback being dropped frequently, which may waste resourcesand degrade system performance. In an example, in case of collision withinvalid symbol(s) for UL transmission, HARQ feedback may be postponedfor a DL SPS transmission.

In an example, dynamic PUCCH carrier switching may be used, for examplefor TDD carriers.

In an example, with short SPS periodicity values, the periodicity valuemay not match with a given semi-static TDD pattern, for example, for theHARQ-ACK feedback timing. The timing of HARQ-ACK feedback for DL SPS maybe indicated by PDSCH-to-HARQ_feedback timing indicator field, ifpresent, in the activation DCI. Otherwise, it may be provided by an RRCparameter dl-DataToUL-ACK. In an example, the HARQ feedback timing value(K1) may not indicate valid UL slot for all SPS PDSCH occasions. The UEmay defer HARQ feedback transmission to the next UL slot/symbols when itcollides with invalid slot/symbols due to mismatch between SPSperiodicity and TDD pattern.

In an example, a wireless device may be indicated a set of k valueswherein a k value for one SPS transmission may be in a time windowconfigured by RRC. In an example, RRC may configure one or more sets ofk values. If more than one sets are configured, one set may be based onthe PDSCH-to-HARQ_feedback timing indicator field in the activating DCI.

In an example, a wireless device may be indicated to dynamically switchan uplink control channel carrier. In an example, a wireless device maydefer transmission of HARQ feedback for a transport block due tocollision (e.g., resource/timing overlap) with a DL or Flexible symbols.In an example, a wireless device may cancel/drop a HARQ feedback due tocollision (e.g., resource/timing overlap) with a high priority uplinkchannel. The wireless device may transmit a deferred orcancelled/dropped HARQ feedback via an uplink resource in a latertiming. Existing feedback mechanisms and/or DRX processes may performinefficiently in response to dynamic uplink carrier switching and/or inresponse to transmission of deferred/or cancelled/dropped HARQfeedbacks. Example embodiments enhance the existing feedback mechanismsand/or DRX processes.

In an example embodiment as shown in FIG. 16 , a wireless device mayreceive one or more messages comprising configuration parameters of aplurality of cells comprising a primary cell and one or more secondarycells. The one or more messages may comprise one or more RRC messages.In an example, the plurality of cells may be provided by one or morebase stations. In an example the one or more base stations may comprisea master base station. In an example, the one or more base stations maycomprise a master base station and a secondary base station (e.g., in adual connectivity scenario). The configuration parameters may comprisean information element (e.g., a physical downlink shared channel (PDSCH)serving cell information element (PDSCH-ServingCellConfig)) indicatingfirst configuration parameters of a first serving cell. The informationelement may be used to configure UE specific PDSCH parameters that maybe common across the wireless device's BWPs of the first serving cell.In an example, the first configuration parameters may indicate aplurality of serving cells configured for transmission of HARQ feedbackof a downlink transport block received via the first serving cell. Forexample, a PUCCH-cell field of the information element may indicate theplurality of serving cells that the wireless device may use fortransmission of HARQ feedback, of a downlink transport block receivedvia the first serving cell, via a PUCCH of a serving cell in theplurality of serving cells. The wireless device may determine a secondserving cell, in the plurality of serving cells, for transmission ofHARQ feedback via a PUCCH of the second serving cell. In an example thefirst configuration parameters (e.g., the PUCCH-cell field) may indicatea respective index (e.g., cell index) for each of the plurality ofserving cells. For example, as shown in FIG. 17 , the PUCCH-cell fieldor another field of the first configuration parameters may indicate asequence of serving cell indexes for the plurality of the serving cellsconfigured for transmission of HARQ feedback for a transport blockreceived via the first serving cell.

In an example, the one or more messages may comprise uplink controlchannel configuration parameters for the plurality of serving cells(e.g., the plurality of serving cells configured for transmission ofHARQ feedback for transport blocks received via the first serving cell).The uplink control channel configuration parameters may comprise commonuplink control channel configuration parameters that are common amongthe plurality of serving cells configured for transmission of a HARQfeedback for transport blocks received via the first serving cell. Thecommon uplink control channel configuration parameters may indicateand/or may be used by the wireless device for determining radioresources of uplink control channel of the plurality of serving cells.The common uplink control channel configuration parameters may be usedfor determining one or more of uplink control channel radio resources,uplink control channel power level using one or more power controlparameters, sub-slot based transmission of uplink control channel,uplink control channel transmission timing, etc.

In an example, the uplink control channel configuration parameters maycomprise respective uplink control channel configuration parameters foreach of the plurality of serving cells (e.g., the plurality of servingcells configured for transmission of HARQ feedback for transport blocksreceived via the first serving cell). The respective uplink controlchannel configuration parameters may be specific to a correspondingserving cell of the plurality of serving cells and may be different fromthe common uplink control channel configuration parameters that arecommon among the plurality of serving cells.

The wireless device may receive a downlink control information (DCI) viaa downlink control channel. The downlink control information may be adownlink scheduling DCI (e.g., with DCI format 1_0 or DCI format 1_1 orDCI 1_2). The DCI may comprise scheduling information for receiving adownlink transport block via the first serving cell. For example, theDCI may indicate the radio resources and one or more slots/sub-slots forreceiving the downlink transport block via the first serving cell. TheDCI may indicate a second serving cell in the plurality of serving cells(e.g., the plurality of serving cells configured for transmission ofHARQ feedback for transport blocks received via the first serving cell).The wireless device may determine the second serving cell based on theDCI and based on the plurality of serving cells. For example, the DCImay comprise a field, a value of the field indicating the second servingcell in the plurality of serving cells configured for transmission ofHARQ feedback. For example, the field may indicate an index (e.g., acell index or a cell identifier) of the second serving cell. The DCI mayfurther indicate a timing for transmission of HARQ feedback associatedwith the downlink transport block. For example, the DCI may comprise aPDSCH-to-HARQ feedback timing field indicating a timing duration betweenthe reception of the downlink transport block via the PDSCH and thetransmission of the HARQ feedback associated with the downlink transportblock.

The wireless device may receive the downlink transport block based onthe DCI (e.g., via the radio resources of the first serving cellindicated by the DCI). The wireless device may transmit (e.g., at thetiming determined by the wireless device based on the DCI) the HARQfeedback associated with the downlink transport block using an uplinkcontrol channel of the second serving cell (e.g., the second servingcell determined by the wireless device from the plurality of servingcells based on the DCI). In an example, the wireless device may transmitthe HARQ feedback associated with the downlink transport block using thecommon uplink control channel configuration parameters that are commonlyconfigured for the plurality of serving cell (e.g., plurality of servingcell configured for transmission of HARQ feedback for transport blocksreceived via the first serving cell). In an example, the wireless devicemay transmit the HARQ feedback associated with the downlink transportblock using the uplink control channel configuration parameters of thesecond serving cell (e.g., specific to the second serving cell and notcommon uplink control channel configuration parameters) indicated by theDCI. In an example, the wireless device may transmit the HARQ feedbackassociated with the downlink transport block using the common uplinkcontrol channel configuration parameters and the uplink control channelconfiguration parameters of the second serving cell. In an example, thewireless device may transmit the HARQ feedback associate with thedownlink transport via the uplink control channel of an active bandwidthpart of the second serving cell (e.g., the second serving cell indicatedby the DCI).

In an example, the DCI may comprise a field indicating a bandwidth partof the second serving cell wherein the transmission of the HARQ feedbackassociated with the downlink transport block may be via an uplinkcontrol channel of the indicated bandwidth part of the second servingcell. In an example, the indicated BWP of the second serving cell may bedifferent from a current active BWP of the second serving cell. Thewireless device may switch the active bandwidth part of the secondserving cell based on the bandwidth part of the second serving cell,indicated by the DCI, being different from the current active bandwidthpart of the second serving cell.

In an example, the one or more messages may indicate a plurality ofuplink control channel groups for the plurality of cells configured forthe wireless device. For example, the first configuration parameters ofthe first serving cell may indicate that the first serving cell isassociated with an uplink control channel group in the plurality uplinkcontrol channel group. For example, the first configuration parametersof the first serving cell may comprise an identifier of an uplinkcontrol channel group indicating the uplink control channel group thatthe first serving cell is associated with. In an example, the pluralityof serving cells, configured for transmission of HARQ feedbacks ofdownlink transport blocks received via the first serving cell, may be inthe same uplink control channel group. In an example, the plurality ofserving cells, configured for transmission of HARQ feedback of downlinktransport blocks received via the first serving cell, may comprise afirst cell in a first uplink control channel group and a second cell ina second uplink control channel group.

In an example, the DCI may comprise a transmit power control (TPC) fieldindicating a TPC command. The wireless device may determine a powerlevel for transmission of uplink control channel of the second servingcell wherein the wireless device determines the second serving cellindicated by the DCI.

In an example, the wireless device may receive a first DCI comprisingscheduling information for receiving a first transport block and asecond DCI comprising scheduling for receiving a second transport block.The first DCI may indicate transmission of a first HARQ feedback of thefirst transport block via a serving cell and at a first timing and thesecond DCI may indicate transmission of a second HARQ feedback of thesecond transport block via the serving cell at a second timing. Thefirst timing and the second timing may overlap in one or more symbols.The first DCI may comprise a first TPC field indicating a first powercontrol command and the second DCI may comprise a second TPC fieldindicating a second power control command. The wireless device maydetermine a power level for transmission of uplink control channel ofthe serving cell, indicated by the first DCI and the second DCI andcarrying the first HARQ feedback and the second HARQ feedback, based onone of the first power control command and the second power controlcommand. For example, the wireless device may select one of the firstpower control command and the second power control command, fordetermining the power level of the uplink control channel of the servingcell, based on the relative reception timing of the first DCI and thesecond DCI. For example, the wireless device may select the second powercontrol command based on receiving the second DCI later than the firstDCI. For example, the wireless device may select one of the first powercontrol command and the second power control command, for determiningthe power level of the uplink control channel of the serving cell, basedon the relative reception timing of the first transport block and thesecond transport block. For example, the wireless device may select thesecond power control command based on receiving the second transportblock later than the first transport block.

In an example as shown in FIG. 18 , the one or more messages mayindicate a plurality of uplink control channel groups comprising a firstuplink control channel group and a second uplink control channel group.The DCI may indicate one of the first uplink control channel group andthe second uplink control channel group. For example, the DCI maycomprise a field, a value of the field indicating an identifier for oneof the first uplink control channel group or the second uplink controlchannel group. The wireless device may determine the second servingcell, for transmission of the HARQ feedback associated with the downlinktransport block, based on the uplink control channel group indicated bythe DCI. The second serving cell may be a cell configured with uplinkcontrol channel in the indicated uplink control channel group. Forexample, the second serving cell may be a primary cell if the uplinkcontrol channel group indicated by the DCI is a primary uplink controlchannel group. For example, the second serving cell may be a secondarycell configured with uplink control channel (e.g., a PUCCH SCell) if theuplink control channel group indicated by the DCI is a secondary uplinkcontrol channel group. In an example, the first serving cell, that thetransport block is received, may be in the first uplink control channelgroup. The downlink control information may comprise a field with avalue indicating one of: the first uplink control channel group; and thesecond uplink control channel group. For example, the field may compriseone or more bits, a first value of the one or more bits may indicate thefirst uplink control channel group (e.g., the uplink control channelgroup that includes the first serving cell) and a second value of theone or more bits may indicate a second uplink control channel (e.g., theuplink control channel group that does not include the first servingcell or includes a different serving cell).

In an example embodiment, the wireless device may receive a mediumaccess control (MAC) control element (MAC CE) indicating a serving cellfor transmission of uplink control channel that carries uplink controlinformation (e.g., HARQ feedback(s)) for transport blocks received viaone or more cells (e.g., a group of cells). For example, the MAC CE maycomprise a field indicating an identifier of the serving cell. Forexample, the MAC CE may indicate the one or more cells (e.g., the groupof cells) based on one or more identifiers of the one or more cells. Forexample, the configuration parameters of the one or more cells maycomprise the one or more identifiers of the one or more identifiers. Forexample, configuration parameters of each of the one or more cells maycomprise a group identifier that the one or more cells belongs to. TheMAC CE may comprise a field, the value of the field may indicate thegroup identifier.

In an example embodiment as shown in FIG. 19 and FIG. 20 , a wirelessdevice may receive a plurality of transport blocks via a downlink sharedchannel (e.g., PDSCH). The plurality of transport blocks may compriseone or more first transport blocks and one or more second transportblocks. The wireless device may defer one or more first HARQ feedbacksassociated with the one or more first transport blocks. The one or morefirst HARQ feedbacks may be referred to as deferred HARQ feedbacks. Forexample, a HARQ feedback in the one or more first HARQ feedbacks may bedeferred based on a timing scheduled for the HARQ feedback collidingwith a downlink symbol or a flexible symbol. The wireless device maydetermine the timing based on a PDSCH-to-HARQ feedback timing field of aDCI (e.g., an SPS activation DCI) and the timing of the reception of thetransport block. The wireless device may not defer one or more secondHARQ feedbacks associated with the one or more second transport blocks.The one or more second HARQ feedbacks may be referred to as non-deferredHARQ feedbacks. For example, the wireless device may receive one or moreDCIs comprising scheduling information for the one or more secondtransport blocks and the one or more DCIs may indicate a first HARQfeedback timing for transmission of the one or more second HARQfeedbacks. The first HARQ feedback timing may be the timing fortransmission of the one or more first HARQ feedbacks (e.g., deferredHARQ feedbacks) and the one or more second HARQ feedbacks (e.g., thenon-deferred HARQ feedbacks). In an example, the wireless device maydetermine the first HARQ feedback timing for transmission of thedeferred HARQ feedbacks based on the first HARQ feedback timing being afirst/earliest available PUCCH resource after the previously scheduledtimings of the one or more first HARQ feedbacks. In an example, thewireless device may determine the first HARQ feedback timing fortransmission of the deferred HARQ feedbacks based on an indication fromthe base station. For example, the indication may be received by thewireless device based on physical layer signaling (e.g., based on a DCIreceived via PDCCH).

The wireless device may construct a HARQ feedback codebook that includesboth the deferred HARQ feedback(s) and the non-deferred HARQfeedback(s). The wireless device may determine an order for the deferredHARQ feedbacks and the non-deferred HARQ feedbacks. The wireless devicemay construct the HARQ feedback codebook based on the determined order.The wireless device may determine positions of the deferred HARQfeedbacks and the non-deferred HARQ feedbacks based on the order and mayconstruct the HARQ feedback codebook based on the determined positionsof the deferred HARQ feedbacks and the non-deferred HARQ feedbacks. Thewireless device may transmit the HARQ feedback codebook using an uplinkchannel. In an example, the wireless device may transmit the HARQfeedback codebook via a PUCCH. In an example, the wireless device maytransmit the HARQ feedback codebook via a PUSCH.

In an example, the wireless device may determine first positions of thenon-deferred HARQ feedbacks based on a first order. The wireless devicemay determine second positions of the deferred HARQ feedbacks based on asecond order. The wireless device may append the ordered non-deferredHARQ feedbacks (based on the first order and according to the firstpositions) to the ordered deferred HARQ feedbacks (based on the secondorder and according to the second positions).

In an example, the one or more first transport blocks and the one ormore second transport blocks may be received via one or more cells. Fora cell of the one or more cells, the wireless device may determine firstpositions of first non-deferred HARQ feedbacks for transport blocks, ofthe one or more second transport blocks, that are received via the cell.The wireless device may determine second positions of second deferredHARQ feedbacks for transport blocks, of the one or more first transportblocks, that are received via the cell. In an example, the secondpositions of the second HARQ feedbacks may be after the firstnon-deferred HARQ feedbacks.

In an example, the one or more first transport blocks and the one ormore second transport blocks may be received via one or more cells andmay be associated with one or more SPS configuration indexes. For a cellof the one or more cells and a SPS configuration index of the one ormore SPS configuration indexes, the wireless device may determine firstpositions of first non-deferred HARQ feedbacks for transport blocks, ofthe one or more second transport blocks, that are received via the celland associated with the SPS configuration index. The wireless device maydetermine second positions of second deferred HARQ feedbacks fortransport blocks, of the one or more first transport blocks, that arereceived via the cell and associated with the SPS configuration index.In an example, the second positions of the second HARQ feedbacks may beafter the first non-deferred HARQ feedbacks.

In an example embodiment, a wireless device may determine a firstposition of a non-deferred HARQ feedback, for a first transport block ina first plurality of transport blocks with non-deferred HARQ feedbacks.The wireless device may determine a second position of a deferred HARQfeedback, for a second transport block in a second plurality oftransport blocks with deferred HARQ feedbacks. The first transport blockmay be associated with a first SPS configuration index. For example, afirst activation DCI may indicate activation of a SPS configuration withthe first SPS configuration index and may indicate a plurality of SPSresources comprising a first SPS resource for the first transport block.The first SPS configuration may be for a first cell (e.g., a first BWPof the first cell) and the wireless device may receive the firsttransport block via the first cell/BWP and based on first configurationparameters of the SPS configuration associated with the first SPSconfiguration index. The wireless device may receive one or more firsttransport blocks, comprising the first transport bock, via the firstcell and the one or more first transport blocks may be associated withthe first configuration index. The first transport blocks may bereceived with a first timing and may have a first relative position(e.g., 1st in the one or more first transport blocks, 2nd in the one ormore first transport blocks, 3rd in the one or more first transportblocks) in the one or more first transport blocks. The wireless devicemay determine the first position of the non-deferred HARQ feedback, forthe first transport block in the first plurality of transport blockswith non-deferred HARQ feedbacks, based on the first configurationindex, the first cell and the first timing/first relative position ofthe first transport blocks in the one or more first transport blocksreceived via the first cell and associated with the first configurationindex. The second transport block may be associated with a second SPSconfiguration index. For example, a second activation DCI may indicateactivation of a SPS configuration with the second SPS configurationindex and may indicate a plurality of SPS resources comprising a secondSPS resource for the second transport block. The second SPSconfiguration may be for a second cell (e.g., a second BWP of the secondcell) and the wireless device may receive the second transport block viathe second cell/BWP and based on second configuration parameters of theSPS configuration associated with the second SPS configuration index.The wireless device may receive one or more second transport blocks,comprising the second transport bock, via the second cell and the one ormore second transport blocks may be associated with the secondconfiguration index. The second transport blocks may be received with asecond timing and may have a second relative position (e.g., 1st in theone or more second transport blocks, 2nd in the one or more secondtransport blocks, 3rd in the one or more second transport blocks) in theone or more second transport block. The wireless device may determinethe second position of the deferred HARQ feedback, for the secondtransport block in the second plurality of transport blocks withdeferred HARQ feedbacks, based on the second configuration index, thesecond cell and the second timing/second relative position of the secondtransport blocks in the one or more second transport blocks received viathe second cell and associated with the second configuration index. Inan example, the second position may be further based on the firstposition. For example, the second position may be after the firstposition. For example, the second position may be before the firstposition.

In an example embodiment, a wireless device may determine a firstposition of a non-deferred HARQ feedback, for a first transport block,in non-deferred HARQ feedbacks of one or more first transport blocks.The one or more first transport blocks, with non-deferred HARQfeedbacks, may be associated with an SPS configuration index and may bereceived on a cell. The wireless device may determine a second positionof a deferred HARQ feedback, for a second transport block, in deferredHARQ feedbacks of one or more second transport blocks. The one or moresecond transport blocks, with deferred HARQ feedbacks, may be associatedwith the SPS configuration index and may be received on the cell. Thefirst transport block may be received with a first timing and may have afirst relative position (e.g., 1st in the one or more first transportblocks, 2nd in the one or more first transport blocks, 3rd in the one ormore first transport blocks, etc.) in the one or more first transportblocks. The wireless device may determine the first position of thenon-deferred HARQ feedback, for the first transport block, in thenon-deferred HARQ feedbacks of the one or more first transport blocks,based on the first timing/first relative position of the first transportblocks in the one or more first transport blocks. The second transportblock may be received with a second timing and may have a secondrelative position (e.g., 1st in the one or more second transport blocks,2nd in the one or more second transport blocks, 3rd in the one or moresecond transport blocks, etc.) in the one or more second transportblocks. The wireless device may determine the second position of thedeferred HARQ feedback, for the second transport block, in the deferredHARQ feedbacks of the one or more second transport blocks based on thesecond timing/second relative position of the second transport blocks inthe one or more second transport blocks. In an example, the secondposition may be further based on the first position. For example, thesecond position may be after the first position. For example, the secondposition may be before the first position.

In an example embodiment, a wireless device may determine a firstposition of a non-deferred HARQ feedback, for a first transport block,in non-deferred HARQ feedbacks of one or more first transport blocks.The one or more first transport blocks, with non-deferred HARQfeedbacks, may be received on a cell. The wireless device may determinea second position of a deferred HARQ feedback, for a second transportblock, in deferred HARQ feedbacks of one or more second transportblocks. The one or more second transport blocks, with deferred HARQfeedbacks, may be received on the cell. The first transport block may bereceived with a first timing and may have a first relative position(e.g., 1st in the one or more first transport blocks, 2nd in the one ormore first transport blocks, 3rd in the one or more first transportblocks, etc.) in the one or more first transport blocks. The firsttransport block may be associated with a first SPS configuration index.The wireless device may determine the first position of the non-deferredHARQ feedback, for the first transport block, in the non-deferred HARQfeedbacks of the one or more first transport blocks, based on the firsttiming/first relative position of the first transport blocks in the oneor more first transport blocks and the first configuration indexassociated with the first transport block. The second transport blockmay be received with a second timing and may have a second relativeposition (e.g., 1st in the one or more second transport blocks, 2nd inthe one or more second transport blocks, 3rd in the one or more secondtransport blocks, etc.) in the one or more second transport blocks. Thesecond transport block may be associated with a second SPS configurationindex. The wireless device may determine the second position of thedeferred HARQ feedback, for the second transport block, in the deferredHARQ feedbacks of the one or more second transport blocks, based on thesecond timing/second relative position of the second transport blocks inthe one or more second transport blocks and the second configurationindex associated with the second transport block. In an example, thesecond position may be further based on the first position. For example,the second position may be after the first position. For example, thesecond position may be before the first position.

The wireless device may determine an ordered plurality of HARQ feedbacksbased on positions of the plurality of HARQ feedbacks comprising thefirst position of the non-deferred HARQ feedback and the second positionof the deferred HARQ feedback. The wireless device may transmit theordered plurality of HARQ feedbacks using an uplink channel. In anexample, the wireless device may transmit the ordered plurality of HARQfeedbacks using an uplink control channel. In an example, the wirelessdevice may transmit the ordered plurality of HARQ feedbacks using anuplink shared channel. In an example, the wireless device may transmitthe ordered plurality of HARQ feedbacks in a first timing. The wirelessdevice may construct a HARQ feedback codebook comprising the orderedplurality of HARQ feedbacks and may transmit the HARQ feedback codebookin the first timing. The first timing may be a first slot or one or moresymbols within a first slot. The transport blocks with deferred HARQfeedbacks may be received on or after a time window or within a timewindow before the first timing of transmission of the HARQ feedbackcodebook. The wireless device may determine the deferred HARQ feedbacksfor including in the HARQ feedback codebook, based on the transportblocks, corresponding to the deferred HARQ feedbacks, being received onor after the time window before the first timing. The time window maycomprise a first number of slots/symbols. In an example, the time windowmay have a pre-determined/pre-configured value. In an example, thewireless device may receive configuration parameters (e.g., RRCconfiguration parameters) indicating the time window.

In an example embodiment, as shown in FIG. 21 and FIG. 22 , a wirelessdevice may receive a plurality of transport blocks via a downlink sharedchannel (e.g., PDSCH). The wireless device may defer the HARQ feedbacksassociated with the plurality of transport blocks. The plurality of HARQfeedbacks may be referred to as deferred HARQ feedbacks. The wirelessdevice may construct a HARQ feedback codebook comprising the deferredHARQ feedbacks and may transmit the HARQ feedback codebook using anuplink channel (e.g., a PUCCH). In an example, the HARQ feedbackcodebook may comprise only the deferred HARQ feedbacks. In an example,the HARQ feedback codebook may not comprise a non-deferred HARQfeedback. The wireless device may determine a position of each deferredHARQ feedback, in the deferred HARQ feedbacks, and may determine ordereddeferred HARQ feedbacks based on the determined positions of thedeferred HARQ feedbacks. The wireless device may construct the HARQfeedback codebook based on the ordered deferred HARQ feedbacks. Adeferred HARQ feedback may be associated with a transport block in theplurality of transport blocks. The transport block may be associatedwith a SPS configuration with a SPS configuration index. For example,the SPS configuration parameters associated with the SPS configurationmay indicate the SPS configuration index. For example, an SPS activationDCI indicating the activation of the SPS configuration and activating aplurality of SPS resources, comprising a first SPS resource for thetransport block, may indicate the first SPS configuration. The wirelessdevice may receive the transport blocks via a cell (e.g., a BWP of thecell). For example, the SPS configuration may be configured for the cell(e.g., the BWP of the cell). The transport block may be received with atiming in one or more first transport blocks, of the plurality oftransport blocks that are associated with the SPS configuration indexand received on the cell. The transport block may be received with arelative position (e.g., 1st in the one or more first transport blocks,2nd in the one or more first transport blocks, 3rd in the one or morefirst transport blocks, etc.) in the one or more first transport blocksof the plurality of transport blocks that are associated with the SPSconfiguration index and received on the cell. The position of a deferredHARQ feedback of the transport block, in the deferred HARQ feedbacks ofthe plurality of transport blocks, may be based on the SPS configurationindex, the cell on which the transport block is received and the timingof the transport block in the one or more first transport blocks thatare associated with the SPS configuration index and are received on thecell.

The wireless device may transmit the HARQ feedback codebook in the firsttiming. The first timing may be a first slot or one or more symbolswithin a first slot. The transport blocks with deferred HARQ feedbacksmay be received on or after a time window or within a time window beforethe first timing of transmission of the HARQ feedback codebook. Thewireless device may determine the deferred HARQ feedbacks for includingin the HARQ feedback codebook, based on the plurality of transportblocks, corresponding to the deferred HARQ feedbacks, being received onor after the time window before the first timing. The time window maycomprise a first number of slots/symbols. In an example, the time windowmay have a pre-determined/pre-configured value. In an example, thewireless device may receive configuration parameters (e.g., RRCconfiguration parameters) indicating the time window.

In an example embodiment as shown in FIG. 23 , a wireless device mayreceive a plurality of transport blocks. A plurality of HARQ feedbacks,of the plurality of transport blocks, may be cancelled and/or dropped.For example, at least some of the plurality of HARQ feedbacks may becancelled/dropped in response to at least some of the plurality of HARQfeedbacks colliding with one or more high priority uplink channelsand/or one or more first timings for transmissions of at least some ofthe plurality of HARQ feedbacks overlapping (in one or more symbols)with one or more second timings for transmissions of high priorityuplink channels (e.g., one or more high priority PUSCH, one or more highpriority PUCCH, etc.). For example, at least some of the one or moretransport blocks, may be associated with lower priority compared to thehigher priority associated with the one or more high priority channels.For example, at least some of the one or more transport blocks may beassociated with a first service type (e.g., enhanced mobile broadband(eMBB) service type) and the one or more high priority uplink channelsmay be associated with a second service type (e.g., ultra-reliablelow-latency communications (URLLC) type). For example, the wirelessdevice may receive cancellation signaling (e.g., one or morecancellation DCIs) indicating cancellation of one or more channelscarrying at least some of the plurality of HARQ feedbacks. The wirelessdevice may drop/cancel transmission of at least some of the plurality ofHARQ feedbacks in response to receiving the cancellation signaling.

The wireless device may construct a HARQ feedback codebook comprisingthe previously cancelled/dropped HARQ feedbacks and may transmit theHARQ feedback codebook using an uplink channel (e.g., a PUCCH). In anexample, the HARQ feedback codebook may comprise only the previouslycancelled/dropped HARQ feedbacks. In an example, the HARQ feedbackcodebook may not comprise a non-cancelled/dropped HARQ feedback. Thewireless device may determine a position of each previouslycancelled/dropped HARQ feedback, in the previously cancelled/droppedHARQ feedbacks, and may determine ordered previously cancelled/droppedHARQ feedbacks based on the determined positions of the previouslycancelled/dropped HARQ feedbacks. The wireless device may construct theHARQ feedback codebook based on the ordered previously cancelled/droppedHARQ feedbacks.

A previously cancelled/dropped HARQ feedback may be associated with atransport block in the plurality of transport blocks. The wirelessdevice may receive the transport blocks via a cell (e.g., a BWP of thecell). The transport block may be received with a timing in one or morefirst transport blocks, of the plurality of transport blocks that arereceived via the cell (e.g., the BWP of the cell). The transport blockmay be received with a relative position (e.g., 1st in the one or morefirst transport blocks, 2nd in the one or more first transport blocks,3rd in the one or more first transport blocks, etc.) in the one or morefirst transport blocks of the plurality of transport blocks that arereceived via the cell (e.g., the BWP of the cell). The transport blockmay be associated with a HARQ process identifier. For example, a DCIscheduling the transport block may indicate the HARQ process identifier.

In an example embodiment. the position of a previously cancelled/droppedHARQ feedback of the transport block, in the previouslycancelled/dropped HARQ feedbacks of the plurality of transport blocks,may be based on the cell/BWP on which the transport block is receivedand the timing of the transport block in the one or more first transportblocks of the plurality of transport blocks that are received via thecell (e.g., the BWP of the cell).

In an example embodiment, the position of a previously cancelled/droppedHARQ feedback of the transport block, in the previouslycancelled/dropped HARQ feedbacks of the plurality of transport blocks,may be based on the cell/BWP on which the transport block is receivedand the HARQ process identifier associated with the transport block.

In an example embodiment, a wireless device may receive one or moremessages (e.g., one or more RRC messages) comprising configurationparameters. The configuration parameters may comprise discontinuousreception (DRX) configuration parameters. The DRX configurationparameters may comprise a first value of a HARQ round-trip-time (HARQRTT) timer and a second value of a DRX retransmission timer. Thewireless device may receive a downlink transport block. The wirelessdevice may receive a DCI comprising scheduling information for (e.g.indicating radio resources for reception of) the downlink transportblock. The DCI may comprise a field indicating a first timing fortransmission of HARQ feedback of the transport block. For example, aPDSCH-to-HARQ feedback timing field of the DCI may indicate the firsttiming for transmission of the HARQ feedback of the transport block. Forexample, the PDSCH-to-HARQ feedback timing field of the DCI may indicatea duration between the reception of the downlink transport block and thefirst timing for scheduled transmission of the HARQ feedback of thetransport block. The wireless device may determine to drop/cancel thescheduled HARQ feedback of the transport block at a first timing. Thewireless device may drop/cancel scheduled transmission of a HARQfeedback at the first timing in response to the first timing overlappingwith a second timing of transmission of a high priority uplink channel.For example, the downlink transport block may be associated with a firstservice type (e.g., an enhanced mobile broadband (eMBB) service type)and the high priority uplink channel may be associated with a secondservice type (e.g., an ultra-reliable low-latency communications (URLLC)service type). In an example, the wireless device may determine todrop/cancel scheduled transmission of a HARQ feedback in response toreceiving a cancellation signaling (e.g., a cancellation DCI) indicatingcancellation of transmission of an uplink channel carrying the HARQfeedback. The wireless device may determine to transmit the HARQfeedback at a second timing instead of the first timing.

In an example embodiment as shown in FIG. 24 , the wireless device maydetermine to transmit the HARQ feedback at the second timing instead ofthe first timing based on receiving an indication (e.g., a DCI)indicating the second timing. For example, the wireless device mayreceive a DCI comprising a field and a value of the field may indicatethe second timing. The wireless device may determine that the DCI is forindicating a timing for a cancelled HARQ feedback based on a format ofthe DCI and/or an RNTI associated with the DCI and/or a value of a fieldof the DCI. The wireless device may start the HARQ RTT timer with thefirst value, indicated by the DRX configuration parameters, in a first(e.g., earliest symbol) after the transmission of the HARQ feedback inthe second timing. The wireless device may start the DRX retransmissiontimer with the second value, indicated by the DRX configurationparameters, based on the HARQ RTT timer expiring. The wireless devicemay be in a DRX Active time and may monitor a control channel while theDRX retransmission timer running. The wireless device may receive a DCIbased on monitoring the control channel while the DRX retransmissiontimer running. The DCI may indicate a retransmission of the transportblock. For example, the HARQ feedback, transmitted in the second timing,may be a negative acknowledgement indicating incorrect reception of thetransport block. The DCI may comprise scheduling information forretransmission of the transport block and the wireless device mayreceive the retransmission of the transport block based on thescheduling information indicated by the DCI.

In an example embodiment as shown in FIG. 25 , the wireless device maystart the DRX retransmission timer, with the second value indicated bythe DRX configuration parameters, in a first (e.g., earliest) symbolafter the first timing of the scheduled and dropped HARQ feedback. Thewireless device may be in a DRX Active time and may monitor a controlchannel while the DRX retransmission timer running. The wireless devicemay receive a DCI based on monitoring the control channel while the DRXretransmission timer running. The DCI may indicate a retransmission ofthe transport block. The DCI may comprise scheduling information forretransmission of the transport block and the wireless device mayreceive the retransmission of the transport block based on thescheduling information indicated by the DCI.

In an example embodiment, a wireless device may receive one or moremessages comprising first configuration parameters, of a first servingcell, indicating a plurality of serving cells for transmission of HARQfeedback of a downlink transport block received via the first servingcell. The wireless device may receive a downlink control informationindicating: scheduling information for receiving a transport block viathe first serving cell; and a second serving cell in the plurality ofserving cells. The wireless device may receive the transport block basedon the scheduling information. The wireless device may transmit a firstHARQ feedback, associated with the transport block, via an uplinkcontrol channel of the second serving cell indicated by the downlinkcontrol information.

In an example, the downlink control information may comprise a fieldwith a value indicating the second serving cell.

In an example, the first configuration parameters may comprise aphysical downlink shared channel serving cell configuration informationelement indicating the plurality of serving cells for transmission ofHARQ feedback of a downlink transport block received on the firstserving cell.

In an example, the one or more messages may comprise secondconfiguration parameters, of uplink control channel, that are commonamong the plurality of serving cells. In an example, the transmittingthe first HARQ feedback may be based on the second configurationparameters, of uplink control channel, that are common among theplurality of serving cells.

In an example, the one or more messages may comprise respective uplinkcontrol channel configuration parameters for each of the plurality ofserving cells. The transmitting the first HARQ feedback may be based onuplink control channel configuration parameters of the second servingcell.

In an example, the first configuration parameters may comprise arespective index associated with each serving cell in the plurality ofserving cell. The downlink control information may comprise a field, thevalue of the field being the index associated with the second servingcell.

In an example, the transmitting a first HARQ feedback may be via anuplink control channel of an active bandwidth part of the second servingcell indicated by the downlink control information.

In an example, the downlink control information may comprise a secondfield with a second value indicating a bandwidth part of the secondserving cell. In an example, the wireless device may switch an activebandwidth part of the second serving cell based on the bandwidth part ofthe second serving cell, indicated by the downlink control information,being different from a current active bandwidth part of the secondserving cell.

In an example, the one or more messages may indicate a plurality ofuplink control channel groups. The plurality of serving cells fortransmission of HARQ feedback may be in a same uplink control channelgroup.

In an example, the one or more messages may indicate a plurality ofuplink control channel groups. The plurality of serving cells, fortransmission of HARQ feedback, may comprise a first cell in a firstuplink control channel group and a second cell in a second uplinkcontrol channel group.

In an example, the one or more messages may indicate a first uplinkcontrol channel group and a second uplink control channel group. Thedownlink control information may indicate one of the first uplinkcontrol channel group and a second uplink control channel group. Thesecond serving cell may be a cell configured with uplink control channelin the indicated uplink control channel group. In an example, thedownlink control information may comprise a field with a valueindicating an identifier of the indicated uplink control channel group.In an example, the first serving cell, that the transport block isreceived, may be in the first uplink control channel group. The downlinkcontrol information may comprise a field with a value indicating one of:the first uplink control channel group; and the second uplink controlchannel group. In an example, the field may comprise one or more bits; afirst value of the one or more bits may indicate the first uplinkcontrol channel group; and a second value of the one or more bits mayindicate the second uplink control channel group.

In an example embodiment, a wireless device may receive a plurality oftransport blocks comprising one or more first transport blocks and oneor more second transport blocks, wherein: one or more first HARQfeedbacks associated with the one or more first transport blocks may bedeferred HARQ feedbacks; and one or more second HARQ feedbacksassociated with the one or more second transport blocks may benon-deferred HARQ feedbacks. The wireless device may determine an orderfor the deferred HARQ feedbacks and the non-deferred HARQ feedbacks. Thewireless device may construct a HARQ feedback codebook comprising thedeferred HARQ feedbacks and the non-deferred HARQ feedbacks based on thedetermined order. The wireless device may transmit the HARQ feedbackcodebook using an uplink channel.

In an example, the wireless device may receive one or more first DCIscomprising scheduling information for the one or more first transportblocks, wherein: the one or more first DCIs indicate one or more firsttimings for transmission of the one or more first HARQ feedbacks; andthe one or more first HARQ feedbacks may be deferred HARQ feedbacksbased on the one or more first timings colliding with one or moredownlink symbols or flexible symbols.

In an example, the wireless device may receive one or more second DCIscomprising scheduling information for the one or more second transportblocks, wherein: the one or more second DCIs indicate a first HARQfeedback timing; and the first timing is a timing of the transmission ofthe HARQ feedback codebook.

In an example embodiment, a wireless device may determine: a firstposition of a non-deferred HARQ feedback, for a first transport block ina first plurality of transport blocks with non-deferred HARQ feedbacks;and a second position of a deferred HARQ feedback, for a secondtransport block in a second plurality of transport blocks with deferredHARQ feedbacks. The wireless device may determine the first positionbased on: a first SPS configuration index associated with the firsttransport block; a first cell on which the first transport block isreceived; and a first timing of the first transport block in one or morefirst transport blocks, of the first plurality of transport blocks withnon-deferred HARQ feedback, that are associated with the first SPSconfiguration index and are transmitted on the first cell. The wirelessdevice may determine the second position based on: a second SPSconfiguration index associated with the second transport block; a secondcell on which the second transport block is received; and a secondtiming of the second transport block in one or more second transportblocks, of the second plurality of transport blocks with deferred HARQfeedbacks, that are associated with the second SPS configuration indexand are transmitted on the second cell. The wireless device maydetermine an ordered plurality of HARQ feedbacks based on the firstposition and the second position. The wireless device may transmit theordered plurality of HARQ feedbacks using an uplink channel.

In an example embodiment, a wireless device may determine: a firstposition of a non-deferred HARQ feedback for a first transport block inone or more first transport blocks with non-deferred HARQ feedbacks thatare associated with an SPS configuration index and are received on acell; and a second position of a deferred HARQ feedback for a secondtransport block in one or more second transport blocks with deferredHARQ feedbacks that are associated with the SPS configuration index andare received on the cell. The first position may be based on a firsttiming of the first transport block in the one or more first transportblocks. The second position may be based on a second timing of thesecond transport block in the one or more second transport blocks. Thewireless device may determine an ordered plurality of HARQ feedbacksbased on the first position and the second position. The wireless devicemay transmit the ordered plurality of HARQ feedbacks.

In an example embodiment, a wireless device may determine a firstposition of a non-deferred HARQ feedback for a first transport block inone or more first transport blocks with non-deferred HARQ feedbacks thatare received on a cell; and a second position of a deferred HARQfeedback for a second transport block in one or more second transportblocks with deferred HARQ feedbacks that are received on the cell. Thefirst position may be determined based on: a first SPS configurationindex associated with the first transport block; and a first timing ofthe first transport block in one or more third transport blocks, of theone or more first transport blocks, that are associated with the firstSPS configuration index. The second position may be determined based on:a second SPS configuration index associated with the second transportblock; and a second timing of the second transport block in one or morefourth transport blocks, of the one or more second transport blocks,that are associated with the second SPS configuration index. Thewireless device may determine an ordered plurality of HARQ feedbacksbased on the first position and the second position. The wireless devicemay transmit the ordered plurality of HARQ feedbacks.

In an example, the second position may further be based on the firstposition. In an example, the second position may be after the firstposition. In an example, the second position may be before the firstposition.

In an example, the transmitting the ordered plurality of HARQ feedbacksmay be via a PUCCH.

In an example, the transmitting the ordered plurality of HARQ feedbacksmay be at a first timing. The transport blocks with deferred HARQfeedbacks may be received on or after a time window before the firsttiming. In an example, the time window may have apre-determined/pre-configured value. In an example, the wireless devicemay receive configuration parameters indicating the time window. In anexample, the time window may be a first number of slots/symbols. In anexample, the first timing may be a first slot and/or one or more firstsymbols within a first slot.

In an example embodiment, a wireless device may determine a plurality ofpositions, for deferred HARQ feedbacks associated with a plurality oftransport blocks, a position of a deferred HARQ feedback, associatedwith a transport block in the plurality of transport blocks, being basedon: an SPS configuration index associated with the transport block; acell on which the transport block is received; and a timing of thetransport block in one or more first transport blocks, of the pluralityof transport blocks, that are associated with the SPS configurationindex and are received on the cell. The wireless device may determineordered deferred HARQ feedbacks based on the plurality of positions. Thewireless device may transmit the ordered deferred HARQ feedbacks.

In an example, a HARQ feedback codebook, comprising the ordered deferredHARQ feedbacks, may comprise only the ordered deferred HARQ feedbacksand may not comprise a non-deferred HARQ feedback.

In an example embodiment, a wireless device may determine a plurality ofpositions, for a plurality of cancelled/dropped HARQ feedbacksassociated with a plurality of transport blocks, wherein a firstposition of a first cancelled/dropped HARQ feedback, for a firsttransport block in the plurality of transport blocks, may be based on: acell on which the first transport block is received; and a timing of thefirst transport block in one or more first transport blocks of theplurality of transport blocks that are received on the cell. Thewireless device may determine an ordered plurality of cancelled/droppedHARQ feedbacks based on the plurality of positions. The wireless devicemay transmit the ordered plurality of cancelled/dropped HARQ feedbacks.

In an example embodiment, a wireless device may determine a plurality ofpositions, for a plurality of cancelled/dropped HARQ feedbacksassociated with a plurality of transport blocks, wherein a firstposition of a first cancelled/dropped HARQ feedback, for a firsttransport block in the plurality of transport blocks, may be based on: acell on which the first transport block is received; and a HARQ processidentifier associated with the transport block. The wireless device maydetermine an ordered plurality of cancelled/dropped HARQ feedbacks basedon the plurality of positions. The wireless device may transmit theordered plurality of cancelled/dropped HARQ feedbacks.

In an example, a cancelled/dropped HARQ feedback, in the plurality ofcancelled/dropped HARQ feedbacks, may be cancelled/dropped in responseto overlapping with a high priority uplink channel.

In an example, the wireless device may receive a DCI indicating uplinkcancellation, wherein a cancelled/dropped HARQ feedback, in theplurality of cancelled/dropped HARQ feedbacks, is cancelled/dropped inresponse to the uplink cancellation.

In an example embodiment, a wireless device may receive discontinuousreception (DRX) configuration parameters comprising a first value of aHARQ RTT timer and a second value of a DRX retransmission timer. Thewireless device may determine to drop/cancel scheduled transmission of aHARQ feedback, associated with a downlink transport block, at a firsttiming. The wireless device may transmit the HARQ feedback at a secondtiming instead of the first timing. The wireless device may start theHARQ RTT timer with the first value in a first/earliest symbol after thesecond timing. The wireless device may start the DRX retransmissiontimer based on the HARQ RTT timer expiring. The wireless device maymonitor a control channel while the DRX retransmission timer is running.The wireless device may receive a downlink control information, based onthe monitoring, indicating a retransmission of the transport block. Thewireless device may receive the retransmission of the transport blockbased on the downlink control information.

In an example, the determining to drop/cancel scheduled transmission ofa HARQ feedback at the first timing may be in response to the firsttiming overlapping with a second timing of transmission of a highpriority uplink channel.

In an example, the determining to drop/cancel scheduled transmission ofa HARQ feedback at a first timing may be in response to receiving acancellation signaling indicating cancellation of transmission an uplinkchannel carrying the HARQ feedback.

In an example, the wireless device may determine the second timing fortransmission of the HARQ feedback.

In an example, the wireless device may receive an indication indicatingthe second timing. In an example, the indication may be via a firstdownlink control information. In an example, the first downlink controlmay comprise a field, a value of the field indicating the second timing.In an example, the first downlink control information may comprise afield, a value of the field indicating that the first downlink controlinformation is for indicating the second timing.

In an example embodiment, a wireless device may receive discontinuousreception (DRX) configuration parameters comprising a value of a DRXretransmission timer. The wireless device may determine to drop/cancelscheduled transmission of a HARQ feedback, associated with a downlinktransport block, at a first timing. The wireless device may start theDRX retransmission timer in a first (e.g., earliest) symbol after thefirst timing of the scheduled and dropped HARQ feedback. The wirelessdevice may monitor a control channel while the DRX retransmission timeris running. The wireless device may receive a downlink controlinformation, based on the monitoring, indicating a retransmission of thetransport block. The wireless device may receive the retransmission ofthe transport block based on the downlink control information.

In an example, the determining to drop/cancel scheduled transmission ofa HARQ feedback at the first timing may be in response to the firsttiming overlapping with a second timing of transmission of a highpriority uplink channel.

In an example, the determining to drop/cancel scheduled transmission ofa HARQ feedback at a first timing may be in response to receiving acancellation signaling indicating cancellation of transmission of anuplink channel carrying the HARQ feedback.

A wireless device may transmit HARQ feedbacks (e.g., ACKs and/or NACKs)associated with received downlink transport blocks. A HARQ feedback,associated with a downlink TB, may be initially scheduled fortransmission in a first timing. The downlink TB may be asemi-statistically scheduled TB (e.g., using a semi-persistentscheduling (SPS) configuration). The wireless device may defer the HARQfeedback, initially scheduled in the first timing, to a second timing,for example because valid uplink control channel resources not beingavailable in the first timing. Existing HARQ feedback including HARQfeedback codebook construction processes may lead to a mismatch betweenthe base station and the wireless resulting in degraded wireless deviceand wireless network performance, for example, degraded throughput.There is a need to enhance existing HARQ feedback including HARQfeedback codebook construction processes. Example embodiments mayenhance existing HARQ feedback including HARQ feedback codebookconstruction processes.

In an example embodiment as shown in FIG. 26 , a wireless device mayreceive one or more messages (e.g., one or more RRC messages) comprisingconfiguration parameters. The configuration parameters may compriseconfiguration parameters of one or more cells. The configurationparameters may comprise configuration parameters of one or moresemi-persistent scheduling (SPS) configurations. In an example, theconfiguration parameters may comprise uplink control channelconfiguration parameters. The uplink control channel configurationparameters may be used by the wireless device to determine uplinkcontrol channel resources and/or to transmit uplink control informationvia the uplink control channel resources. The wireless device mayreceive a plurality of downlink transport blocks (TBs) comprising afirst TB and one or more second TBs. The plurality of downlink TBs maybe received in one or more timings (e.g., slots, symbols, etc.).

The wireless device may determine a first HARQ feedback (e.g., apositive acknowledgement (ACK) or a negative acknowledgement (NACK))associated with the first TB. The wireless device may determine aninitial timing for transmission of the first HARQ feedback. For example,a DCI scheduling the first TB may comprise a PDSCH-to-HARQ feedbacktiming field with a value indicating a timing between a timing ofreception of the first TB and the initial timing of the HARQ feedbackassociated with the first TB. The wireless device may determine theinitial timing based on the timing of the reception of the first TB andthe value of the PDSCH-to-HARQ feedback timing field of the schedulingDCI. In an example, the first TB may be a SPS TB associated with a SPSconfiguration. An SPS activation DCI, indicating activation of the SPSconfiguration, may comprise a PDSCH-to-HARQ feedback timing field with avalue indicating a timing between a timing of reception of a TB,associated with the SPS configuration, and a corresponding HARQfeedback. The wireless device may determine the initial timing of thefirst HARQ feedback based on the timing of the reception of the first TBand the value of the PDSCH-to-HARQ feedback timing field of the SPSactivation DCI.

The wireless device may determine to defer the first HARQ feedback fromthe initial timing to a first timing. For example, the wireless devicemay determine to defer the first HARQ feedback based on valid uplinkcontrol channel resources not being available in the initial timing. Forexample, the initial timing may comprise one or more downlink symbols.For example, the initial timing may comprise one or more flexiblesymbols. For example, the initial timing may have overlap with timing ofa synchronization signal block (SSB). For example, the configurationparameters may comprise one or more PUCCH configuration parameters thatmay be used by the wireless device to determine valid uplink controlchannel resources and/or to determine whether valid uplink controlchannel resources are available in a timing (e.g., slot, sub-slot, oneor more symbols, etc.). The wireless device may determine that validuplink control channel resources are not available for transmission ofthe first HARQ feedback in the initial timing based on the one or morePUCCH configuration parameters. In an example, the first timing, towhich the first HARQ feedback is deferred from the initial timing, maycomprise valid uplink control channel resources. The wireless device maydetermine (e.g., based on the one or more PUCCH configurationparameters) that valid uplink control channel resources are available inthe first timing. In an example, the wireless device may determine thefirst timing as an earliest timing with available uplink control channelresources.

The wireless device may determine one or more second HARQ feedbacks(e.g., one or more positive acknowledgements (ACKs) and/or one or morenegative acknowledgements (NACKs)) associated with the one or moresecond TBs. The wireless device may determine the first timing fortransmission of the one or more second HARQ feedbacks. The first timingmay be for initial transmission (e.g., without deferral) of the one ormore second HARQ feedbacks.

In an example, at least some of the one or more second TBs may bedynamically scheduled via one or more scheduling DCIs. The one or morescheduling DCIs may comprise PDSCH-to-HARQ feedback timing fields withvalues indicating timings between timings of reception of the at leastsome of the one or more second TBs and the first timing. The wirelessdevice may determine the first timing based on the timings of thereception of the at least some of the one or more second TBs and valuesof the PDSCH-to-HARQ feedback timing fields of the correspondingscheduling DCIs.

In an example, at least some of the one or more second TBs may besemi-statically scheduled (e.g., may be SPS TBs) and may be associatedwith one or more SPS configurations. One or more SPS activation DCIs,indicating activation of the one or more SPS configurations, maycomprise PDSCH-to-HARQ feedback timing fields with values indicatingtimings between the semi-statically scheduled TBs and corresponding HARQfeedbacks. The wireless device may determine the first timing based onthe timings of the reception of the at least some of the one or moresecond TBs, associated with the one or more SPS configurations, and thevalues of the PDSCH-to-HARQ feedback timing fields of the SPS activationDCIs indicating activation of the one or more SPS configurations.

The wireless device may transmit a HARQ feedback codebook in the firsttiming. In an example, the wireless device may transmit the HARQfeedback codebook via an uplink control channel and using uplink controlchannel resources. The HARQ feedback codebook may comprise the firstHARQ feedback and the one or more second HARQ feedbacks. Existing HARQfeedback including HARQ feedback construction processes may lead tomismatch between the wireless device and the base stations, e.g.,mismatch in terms of the positions of the HARQ feedbacks in the HARQfeedback codebook. Example embodiments enhance the HARQ feedbackincluding HARQ feedback construction processes.

The first HARQ feedback may be associated with a first position in thefirst HARQ feedback codebook. The one or more second HARQ feedbacks maybe associated with one or more second positions in the HARQ feedbackcodebook. In an example embodiment, the first position of the first HARQfeedback, in the HARQ feedback codebook, may be after one or more secondpositions of the one or more second HARQ feedbacks in the HARQ feedbackcodebook (e.g., the first HARQ feedback may be appended to the one ormore second HARQ feedbacks). The first position may be after the one ormore second positions based on the first HARQ feedback being a deferredHARQ feedback. The first position may be after the one or more secondpositions based on the first HARQ feedback being a deferred HARQfeedback and the one or more second HARQ feedbacks being non-deferredHARQ feedbacks. The first position may be after the one or more secondpositions based on the first HARQ feedback being deferred from aninitial timing to the first timing and based on the one or more secondHARQ feedbacks being scheduled for initial transmission in the firsttiming. In an example, each HARQ feedback in the HARQ feedback codebookmay be associated with an index. In an example, the first position maybe based on a first index of the first HARQ feedback in the HARQfeedback codebook and the one or more second positions may be based onone or more second indexes of the one or more second HARQ feedbacks inthe HARQ feedback codebook. The first position may be after the one ormore second positions based on the first index being larger than the oneor more second indexes.

In an example, the first HARQ feedback may be one of one or more firstHARQ feedbacks that are deferred from one or more initial timings to thefirst timing. The one or more first HARQ feedbacks may be associatedwith one or more first TBs. One or more first positions of the one ormore first HARQ feedbacks may be after the one or more second positionsof the one or more second HARQ feedbacks (e.g., the one or more firstHARQ feedbacks may be appended to the one or more second HARQfeedbacks). The wireless device may determine a first order of the oneor more first HARQ feedbacks in the HARQ feedback codebook. The one ormore first positions of the one or more first HARQ feedbacks may bebased on the first order. The wireless device may determine the firstorder based on one or more timings that the one or more first TBs arereceived. The wireless device may determine the first order based on oneor more cells that (via which) the one or more first TBs are received.The wireless device may determine the first order based on one or moreconfiguration indexes of one or SPS configurations that the one or morefirst TBs are associated with. The wireless device may determine thefirst order based on the one or more timings that the one or more firstTBs are received, the one or more cells that (via which) the one or morefirst TBs are received, and the one or more configuration indexes of oneor SPS configurations that the one or more first TBs are associatedwith.

The wireless device may determine a second order of the one or moresecond HARQ feedbacks in the HARQ feedback codebook. In an example, thedetermining of the second order of the one or more second HARQ feedbacksmay be independent of the first order of the one or more first HARQfeedbacks. The one or more second positions of the one or more secondHARQ feedbacks may be based on the second order. The wireless maydetermine the second order based on one or more timings that the one ormore second TBs are received. The wireless device may determine thesecond order based on one or more cells that (via which) the one or moresecond TBs are received. The wireless device may determine the secondorder based on the one or more timings that the one or more second TBsare received, and the one or more cells that (via which) the one or moresecond TBs are received. The wireless device may determine the secondorder based on one or more configuration indexes of one or SPSconfigurations that the one or more second TBs are associated with. Thewireless device may determine the second order based on the one or moretimings that the one or more second TBs are received, the one or morecells that (via which) the one or more second TBs are received, and theone or more configuration indexes of one or SPS configurations that theone or more second TBs are associated with.

In accordance with various exemplary embodiments in the presentdisclosure, a device (e.g., a wireless device, a base station and/oralike) may include one or more processors and may include memory thatmay store instructions. The instructions, when executed by the one ormore processors, cause the device to perform actions as illustrated inthe accompanying drawings and described in the specification. The orderof events or actions, as shown in a flow chart of this disclosure, mayoccur and/or may be performed in any logically coherent order. In someexamples, at least two of the events or actions shown may occur or maybe performed at least in part simultaneously and/or in parallel. In someexamples, one or more additional events or actions may occur or may beperformed prior to, after, or in between the events or actions shown inthe flow charts of the present disclosure.

FIG. 27 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure. At 2710, a wirelessdevice may receive a first transport block (TB) and one or more secondTBs. A first hybrid automatic repeat request (HARQ) feedback, associatedwith the first TB, may be deferred from an initial timing to a firsttiming. One or more second HARQ feedbacks, associated with the one ormore second TBs, may be scheduled for initial transmission in the firsttiming. At 2720, the wireless device may transmit, in the first timing,a HARQ feedback codebook comprising the first HARQ feedback and the oneor more second HARQ feedbacks. Based on the first HARQ feedback beingdeferred, a first position of the first HARQ feedback, in the HARQfeedback codebook, may be after one or more second positions of the oneor more second HARQ feedbacks in the HARQ feedback codebook.

In an example embodiment, the first HARQ feedback may be deferred basedon valid uplink control channel resources, for transmission of the firstHARQ feedback, not being available in the initial timing.

In an example embodiment, the initial timing may comprise one or moredownlink symbols.

In an example embodiment, the initial timing may comprise one or moreflexible symbols.

In an example embodiment, the one or more second HARQ feedbacks may notbe deferred. The one or more second HARQ feedbacks may be non-deferredHARQ feedbacks.

In an example embodiment, one or more first HARQ feedbacks, comprisingthe first HARQ feedback, may be deferred from one or more initialtimings, comprising the initial timing, to the first timing. In anexample embodiment, the wireless device may determine a first order ofthe one or more first HARQ feedbacks in the HARQ feedback codebook. Inan example embodiment, one or more first positions, of the one or morefirst HARQ feedbacks in the HARQ feedback codebook, may be based on thefirst order. In example embodiment, the one or more first HARQ feedbacksmay be associated with one or more first TBs comprising the first TB.The determining the first order may be based on: one or moresemi-persistent scheduling (SPS) configuration indexes associated withthe one or more first TBs; one or more cells that the one or more firstTBs are received; and one or more timings of the one or more first TBs.In an example embodiment, the one or more first HARQ feedbacks may beappended to the one or more second HARQ feedbacks.

In an example embodiment, the wireless device may determine a secondorder of the one or more second HARQ feedbacks. The one or more secondpositions may be based on the second order. In an example embodiment,the second order may be based on: one or more cells that the one or moresecond TBs are received; and one or more timings of the one or moresecond TBs. In an example embodiment, the first HARQ feedback may beappended to the one or more second HARQ feedbacks. In an exampleembodiment, the second order may be based on one or more semi-persistentscheduling (SPS) configuration indexes associated with the one or moresecond TBs.

In an example embodiment, the first HARQ feedback may be appended to theone or more second HARQ feedbacks.

In an example embodiment, the first position may be after the one ormore second positions further based on the one or second HARQ feedbacksbeing scheduled for initial transmission in the first timing.

FIG. 28 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure. At 2810, a wirelessdevice may receive a first transport block (TB) and a second TB. A firsthybrid automatic repeat request (HARQ) feedback, associated with thefirst TB, may be deferred from an initial timing to a first timing. Asecond HARQ feedback, associated with the second TB, may be scheduledfor initial transmission in the first timing. At 2820, the wirelessdevice may transmit, in the first timing, a HARQ feedback codebookcomprising the first HARQ feedback and the second HARQ feedbacks. Basedon the first HARQ feedback being deferred, a first position of the firstHARQ feedback, in the HARQ feedback codebook, may be after a secondposition of the second HARQ feedback in the HARQ feedback codebook.

In an example embodiment, the first HARQ feedback may be deferred basedon valid uplink control channel resources, for transmission of the firstHARQ feedback, not being available in the initial timing.

In an example embodiment, the initial timing may comprise one or moredownlink symbols.

In an example embodiment, the initial timing may comprise one or moreflexible symbols.

In an example embodiment, the second HARQ feedback may not be deferred.The second HARQ feedback may be a non-deferred HARQ feedback.

In an example embodiment, the first HARQ feedback may be appended to thesecond HARQ feedback.

In an example embodiment, the first position may be after the secondposition further based on the second HARQ feedback being scheduled forinitial transmission in the first timing.

FIG. 29 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure. At 2910, a wirelessdevice may receive a first transport block (TB) and a second TB. At2920, the wireless device may transmit in a first timing, a hybridautomatic repeat request (HARQ) feedback codebook comprising a firstHARQ feedback associated with the first TB and a second HARQ feedbackassociated with the second TB. A first position of the first HARQfeedback, in the HARQ feedback codebook, may be after a second positionof the second HARQ feedback in the HARQ feedback codebook based on: thefirst HARQ feedback being deferred from an initial timing to the firsttiming; and the second HARQ feedback being scheduled for initialtransmission in the first timing.

FIG. 30 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure. At 3010, a wirelessdevice may receive discontinuous reception (DRX) configurationparameters comprising a first parameter indicating a first value of aHARQ round trip time (RTT) timer. At 3020, the wireless device mayreceive a transport block (TB). At 3030, the wireless device maydetermine to cancel scheduled transmission of a HARQ feedback,associated with the TB, in a first timing in response to an overlap witha high priority uplink channel or an uplink cancellation indication. At3040, the wireless device may transmit the HARQ feedback in a secondtiming, after the first timing, in response to a trigger. At 3050, thewireless device may start the HARQ RTT timer, with the value, in a firstsymbol after the second timing.

In an example embodiment, the DRX configuration parameters, received at3010, may further comprise a second parameter indicating a second valueof a DRX retransmission timer. In an example embodiment, the wirelessdevice may start the DRX retransmission timer in response to expiry ofthe HARQ RTT timer. In an example embodiment, the wireless device may bein a DRX Active time while the DRX retransmission timer is running. Inan example embodiment, the wireless device may monitor a control channelwhile the DRX retransmission timer is running. In an example embodiment,the wireless device may receive, based on the monitoring, downlinkcontrol information comprising a downlink assignment for retransmissionof the TB. In an example embodiment, the wireless device may receive theretransmission of the TB based on the downlink assignment.

In an example embodiment, the determining, at 3030, to cancel thescheduled transmission of the HARQ feedback may be based on the firsttiming overlapping with a second timing of the high priority uplinkchannel.

In an example embodiment, the determining, at 3030, to cancel thescheduled transmission of the HARQ feedback may be based on the uplinkcancellation indication indicating cancellation of an uplink channelscheduled to carry the HARQ feedback.

In an example embodiment, the wireless device may receive a downlinkcontrol information indicating the trigger. In an example embodiment,the downlink control information may comprise a field indicating thesecond timing.

FIG. 31 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure. At 3110, a wirelessdevice may receive discontinuous reception (DRX) configurationparameters comprising a first parameter indicating a value of a DRXretransmission timer. At 3120, the wireless device may receive atransport block (TB). At 3130, the wireless device may determine tocancel scheduled transmission of a HARQ feedback, associated with theTB, in a first timing in response to an overlap with a high priorityuplink channel or an uplink cancellation indication. At 3140, thewireless device may start the DRX retransmission timer, with the value,in a first symbol after the first timing of the scheduled and cancelledHARQ feedback.

In an example embodiment, the wireless device may be in a DRX Activetime while the DRX retransmission timer is timer running.

In an example embodiment, the wireless device may monitor a controlchannel while the DRX retransmission timer is running. In an exampleembodiment, the wireless device may receive, based on the monitoring,downlink control information comprising a downlink assignment forretransmission of the TB. In an example embodiment, the wireless devicemay receive the retransmission of the TB based on the downlinkassignment.

In an example embodiment, the determining, at 3130, to cancel thescheduled transmission of the HARQ feedback may be based on the firsttiming overlapping with a second timing of the high priority uplinkchannel.

In an example embodiment, the determining, at 3130, to cancel thescheduled transmission of the HARQ feedback may be based on the uplinkcancellation indication indicating cancellation of an uplink channelscheduled to carry the HARQ feedback.

FIG. 32 shows an example flow diagram in accordance with several ofvarious embodiments of the present disclosure. At 3210, a wirelessdevice may receive configuration parameters, of a first serving cell,indicating a plurality of serving cells for transmission of hybridautomatic repeat request (HARQ) feedbacks associated with transportblocks (TBs) received via the first serving cell. At 3220, the wirelessdevice may receive a downlink control information (DCI) indicating:scheduling information for receiving a TB via the first serving cell;and a second serving cell, in the plurality of serving cells, for HARQfeedback transmission. At 3230, the wireless device may receive the TBbased on the scheduling information. At 3240, the wireless device maytransmit a first HARQ feedback, associated with the TB, via an uplinkcontrol channel of the second serving cell indicated by the DCI.

In an example embodiment, the DCI, received at 3220, may comprise afield with a value indicating the second serving cell.

In an example embodiment, the configuration parameters, received at3210, may comprise a physical downlink shared channel serving cellconfiguration information element indicating the plurality of servingcells.

Various exemplary embodiments of the disclosed technology are presentedas example implementations and/or practices of the disclosed technology.The exemplary embodiments disclosed herein are not intended to limit thescope. Persons of ordinary skill in the art will appreciate that variouschanges can be made to the disclosed embodiments without departure fromthe scope. After studying the exemplary embodiments of the disclosedtechnology, alternative aspects, features and/or embodiments will becomeapparent to one of ordinary skill in the art. Without departing from thescope, various elements or features from the exemplary embodiments maybe combined to create additional embodiments. The exemplary embodimentsare described with reference to the drawings. The figures and theflowcharts that demonstrate the benefits and/or functions of variousaspects of the disclosed technology are presented for illustrationpurposes only. The disclosed technology can be flexibly configuredand/or reconfigured such that one or more elements of the disclosedembodiments may be employed in alternative ways. For example, an elementmay be optionally used in some embodiments or the order of actionslisted in a flowchart may be changed without departure from the scope.

An example embodiment of the disclosed technology may be configured tobe performed when deemed necessary, for example, based on one or moreconditions in a wireless device, a base station, a radio and/or corenetwork configuration, a combination thereof and/or alike. For example,an example embodiment may be performed when the one or more conditionsare met. Example one or more conditions may be one or moreconfigurations of the wireless device and/or base station, traffic loadand/or type, service type, battery power, a combination of thereofand/or alike. In some scenarios and based on the one or more conditions,one or more features of an example embodiment may be implementedselectively.

In this disclosure, the articles “a” and “an” used before a group of oneor more words are to be understood as “at least one” or “one or more” ofwhat the group of the one or more words indicate. The use of the term“may” before a phrase is to be understood as indicating that the phraseis an example of one of a plurality of useful alternatives that may beemployed in an embodiment in this disclosure.

In this disclosure, an element may be described using the terms“comprises”, “includes” or “consists of” in combination with a list ofone or more components. Using the terms “comprises” or “includes”indicates that the one or more components are not an exhaustive list forthe description of the element and do not exclude components other thanthe one or more components. Using the term “consists of” indicates thatthe one or more components is a complete list for description of theelement. In this disclosure, the term “based on” is intended to mean“based at least in part on”. The term “based on” is not intended to mean“based only on”. In this disclosure, the term “and/or” used in a list ofelements indicates any possible combination of the listed elements. Forexample, “X, Y, and/or Z” indicates X; Y; Z; X and Y; X and Z; Y and Z;or X, Y, and Z.

Some elements in this disclosure may be described by using the term“may” in combination with a plurality of features. For brevity and easeof description, this disclosure may not include all possiblepermutations of the plurality of features. By using the term “may” incombination with the plurality of features, it is to be understood thatall permutations of the plurality of features are being disclosed. Forexample, by using the term “may” for description of an element with fourpossible features, the element is being described for all fifteenpermutations of the four possible features. The fifteen permutationsinclude one permutation with all four possible features, fourpermutations with any three features of the four possible features, sixpermutations with any two features of the four possible features andfour permutations with any one feature of the four possible features.

Although mathematically a set may be an empty set, the term set used inthis disclosure is a nonempty set. Set B is a subset of set A if everyelement of set B is in set A. Although mathematically a set has an emptysubset, a subset of a set is to be interpreted as a non-empty subset inthis disclosure. For example, for set A={subcarrier1, subcarrier2}, thesubsets are {subcarrier1}, {subcarrier2} and {subcarrier1, subcarrier2}.

In this disclosure, the phrase “based on” may be used equally with“based at least on” and what follows “based on” or “based at least on”indicates an example of one of plurality of useful alternatives that maybe used in an embodiment in this disclosure. The phrase “in response to”may be used equally with “in response at least to” and what follows “inresponse to” or “in response at least to” indicates an example of one ofplurality of useful alternatives that may be used in an embodiment inthis disclosure. The phrase “depending on” may be used equally with“depending at least on” and what follows “depending on” or “depending atleast on” indicates an example of one of plurality of usefulalternatives that may be used in an embodiment in this disclosure. Thephrases “employing” and “using” and “employing at least” and “using atleast” may be used equally in this in this disclosure and what follows“employing” or “using” or “employing at least” or “using at least”indicates an example of one of plurality of useful alternatives that maybe used in an embodiment in this disclosure.

The example embodiments disclosed in this disclosure may be implementedusing a modular architecture comprising a plurality of modules. A modulemay be defined in terms of one or more functions and may be connected toone or more other elements and/or modules. A module may be implementedin hardware, software, firmware, one or more biological elements (e.g.,an organic computing device and/or a neurocomputer) and/or a combinationthereof and/or alike. Example implementations of a module may be assoftware code configured to be executed by hardware and/or a modelingand simulation program that may be coupled with hardware. In an example,a module may be implemented using general-purpose or special-purposeprocessors, digital signal processors (DSPs), microprocessors,microcontrollers, application-specific integrated circuits (ASICs),programmable logic devices (PLDs) and/or alike. The hardware may beprogrammed using machine language, assembly language, high-levellanguage (e.g., Python, FORTRAN, C, C++ or the like) and/or alike. In anexample, the function of a module may be achieved by using a combinationof the mentioned implementation methods.

What is claimed is:
 1. A method comprising: determining, by a wirelessdevice: an initial timing of a first hybrid automatic repeat request(HARQ) feedback; and a first timing of one or more second HARQfeedbacks; determining to defer the first HARQ feedback from the initialtiming to the first timing based on the initial timing overlapping withone or more downlink symbols; transmitting, in the first timing, a HARQfeedback codebook comprising the first HARQ feedback and the one or moresecond HARQ feedbacks; and wherein, based on the first HARQ feedbackbeing deferred, a first position of the first HARQ feedback, in anordered plurality of HARQ feedbacks within the HARQ feedback codebook,is after one or more second positions of the one or more second HARQfeedbacks.
 2. The method of claim 1, wherein the first timing does notcomprise a downlink symbol.
 3. The method of claim 1, wherein the one ormore second HARQ feedbacks are not deferred.
 4. The method of claim 1,further comprising determining a first order of one or more first HARQfeedbacks in the HARQ feedback codebook, wherein the one or more firstHARQ feedbacks are deferred from one or more initial timings to thefirst timing.
 5. The method of claim 4, wherein one or more firstpositions, of the one or more first HARQ feedbacks in the HARQ feedbackcodebook, are based on the first order.
 6. The method of claim 4,wherein the one or more first HARQ feedbacks are appended to the one ormore second HARQ feedbacks.
 7. The method of claim 1, further comprisingdetermining a second order of the one or more second HARQ feedbacks,wherein the one or more second positions are based on the second order.8. The method of claim 1, wherein the first position is after the one ormore second positions further based on the one or more second HARQfeedbacks being scheduled for initial transmission in the first timing.9. A wireless device comprising: one or more processors; and memorystoring instructions that, when executed by the one or more processors,cause the wireless device to: determine: an initial timing of a firsthybrid automatic repeat request (HARQ) feedback; and a first timing ofone or more second HARQ feedbacks; determine to defer the first HARQfeedback from the initial timing to the first timing based on theinitial timing overlapping with one or more downlink symbols; transmit,in the first timing, a HARQ feedback codebook comprising the first HARQfeedback and the one or more second HARQ feedbacks; and wherein, basedon the first HARQ feedback being deferred, a first position of the firstHARQ feedback, in an ordered plurality of HARQ feedbacks within the HARQfeedback codebook, is after one or more second positions of the one ormore second HARQ feedbacks.
 10. The wireless device of claim 9, whereinthe first timing does not comprise a downlink symbol.
 11. The wirelessdevice of claim 9, wherein the one or more second HARQ feedbacks are notdeferred.
 12. The wireless device of claim 9, wherein the instructions,when executed by the one or more processors, further cause the wirelessdevice to determine a first order of one or more first HARQ feedbacks inthe HARQ feedback codebook, wherein the one or more first HARQ feedbacksare deferred from one or more initial timings to the first timing. 13.The wireless device of claim 12, wherein one or more first positions, ofthe one or more first HARQ feedbacks in the HARQ feedback codebook, arebased on the first order.
 14. The wireless device of claim 12, whereinthe one or more first HARQ feedbacks are appended to the one or moresecond HARQ feedbacks.
 15. The wireless device of claim 9, wherein theinstructions, when executed by the one or more processors, further causethe wireless device to determine a second order of the one or moresecond HARQ feedbacks, wherein the one or more second positions arebased on the second order.
 16. The wireless device of claim 9, whereinthe first position is after the one or more second positions furtherbased on the one or more second HARQ feedbacks being scheduled forinitial transmission in the first timing.
 17. A system comprising: abase station; and a wireless device comprising: one or more processors;and memory storing instructions that, when executed by the one or moreprocessors, cause the wireless device to: determine: an initial timingof a first hybrid automatic repeat request (HARQ) feedback; and a firsttiming of one or more second HARQ feedbacks; determine to defer thefirst HARQ feedback from the initial timing to the first timing based onthe initial timing overlapping with one or more downlink symbols;transmit, to the base station in the first timing, a HARQ feedbackcodebook comprising the first HARQ feedback and the one or more secondHARQ feedbacks; and wherein, based on the first HARQ feedback beingdeferred, a first position of the first HARQ feedback, in an orderedplurality of HARQ feedbacks within the HARQ feedback codebook, is afterone or more second positions of the one or more second HARQ feedbacks.18. The system of claim 17, wherein the first timing does not comprise adownlink symbol.
 19. The system of claim 17, wherein the one or moresecond HARQ feedbacks are not deferred.
 20. The system of claim 17,wherein the first position is after the one or more second positionsfurther based on the one or more second HARQ feedbacks being scheduledfor initial transmission in the first timing.